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Writing a Literature Review

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

• An introductory paragraph that explains what your working topic and thesis is
• A forecast of key topics or texts that will appear in the review
• Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
• Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically Evaluate: Mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

• Summarize the key findings you have taken from the literature and emphasize their significance
• Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

• Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
• Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
• Qualitative versus quantitative research
• Empirical versus theoretical scholarship
• Divide the research by sociological, historical, or cultural sources
• Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

• It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
• Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
• Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
• Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

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What is a Literature Review? How to Write It (with Examples)

A literature review is a critical analysis and synthesis of existing research on a particular topic. It provides an overview of the current state of knowledge, identifies gaps, and highlights key findings in the literature. 1 The purpose of a literature review is to situate your own research within the context of existing scholarship, demonstrating your understanding of the topic and showing how your work contributes to the ongoing conversation in the field. Learning how to write a literature review is a critical tool for successful research. Your ability to summarize and synthesize prior research pertaining to a certain topic demonstrates your grasp on the topic of study, and assists in the learning process. 

Table of Contents

• What is the purpose of literature review? 
• a. Habitat Loss and Species Extinction: 
• b. Range Shifts and Phenological Changes: 
• c. Ocean Acidification and Coral Reefs: 
• d. Adaptive Strategies and Conservation Efforts: 
• How to write a good literature review 
• Choose a Topic and Define the Research Question: 
• Decide on the Scope of Your Review: 
• Select Databases for Searches: 
• Conduct Searches and Keep Track: 
• Review the Literature: 
• Organize and Write Your Literature Review: 
• Frequently asked questions 

What is a literature review?

A well-conducted literature review demonstrates the researcher’s familiarity with the existing literature, establishes the context for their own research, and contributes to scholarly conversations on the topic. One of the purposes of a literature review is also to help researchers avoid duplicating previous work and ensure that their research is informed by and builds upon the existing body of knowledge.

What is the purpose of literature review?

A literature review serves several important purposes within academic and research contexts. Here are some key objectives and functions of a literature review: 2  

• Contextualizing the Research Problem: The literature review provides a background and context for the research problem under investigation. It helps to situate the study within the existing body of knowledge. 
• Identifying Gaps in Knowledge: By identifying gaps, contradictions, or areas requiring further research, the researcher can shape the research question and justify the significance of the study. This is crucial for ensuring that the new research contributes something novel to the field. 
• Understanding Theoretical and Conceptual Frameworks: Literature reviews help researchers gain an understanding of the theoretical and conceptual frameworks used in previous studies. This aids in the development of a theoretical framework for the current research. 
• Providing Methodological Insights: Another purpose of literature reviews is that it allows researchers to learn about the methodologies employed in previous studies. This can help in choosing appropriate research methods for the current study and avoiding pitfalls that others may have encountered. 
• Establishing Credibility: A well-conducted literature review demonstrates the researcher’s familiarity with existing scholarship, establishing their credibility and expertise in the field. It also helps in building a solid foundation for the new research. 
• Informing Hypotheses or Research Questions: The literature review guides the formulation of hypotheses or research questions by highlighting relevant findings and areas of uncertainty in existing literature. 

Literature review example

Let’s delve deeper with a literature review example: Let’s say your literature review is about the impact of climate change on biodiversity. You might format your literature review into sections such as the effects of climate change on habitat loss and species extinction, phenological changes, and marine biodiversity. Each section would then summarize and analyze relevant studies in those areas, highlighting key findings and identifying gaps in the research. The review would conclude by emphasizing the need for further research on specific aspects of the relationship between climate change and biodiversity. The following literature review template provides a glimpse into the recommended literature review structure and content, demonstrating how research findings are organized around specific themes within a broader topic. 

Literature Review on Climate Change Impacts on Biodiversity:

Climate change is a global phenomenon with far-reaching consequences, including significant impacts on biodiversity. This literature review synthesizes key findings from various studies: 

a. Habitat Loss and Species Extinction:

Climate change-induced alterations in temperature and precipitation patterns contribute to habitat loss, affecting numerous species (Thomas et al., 2004). The review discusses how these changes increase the risk of extinction, particularly for species with specific habitat requirements. 

b. Range Shifts and Phenological Changes:

Observations of range shifts and changes in the timing of biological events (phenology) are documented in response to changing climatic conditions (Parmesan & Yohe, 2003). These shifts affect ecosystems and may lead to mismatches between species and their resources. 

c. Ocean Acidification and Coral Reefs:

The review explores the impact of climate change on marine biodiversity, emphasizing ocean acidification’s threat to coral reefs (Hoegh-Guldberg et al., 2007). Changes in pH levels negatively affect coral calcification, disrupting the delicate balance of marine ecosystems. 

d. Adaptive Strategies and Conservation Efforts:

Recognizing the urgency of the situation, the literature review discusses various adaptive strategies adopted by species and conservation efforts aimed at mitigating the impacts of climate change on biodiversity (Hannah et al., 2007). It emphasizes the importance of interdisciplinary approaches for effective conservation planning. 

How to write a good literature review

Writing a literature review involves summarizing and synthesizing existing research on a particular topic. A good literature review format should include the following elements. 

Introduction: The introduction sets the stage for your literature review, providing context and introducing the main focus of your review. 

• Opening Statement: Begin with a general statement about the broader topic and its significance in the field. 
• Scope and Purpose: Clearly define the scope of your literature review. Explain the specific research question or objective you aim to address. 
• Organizational Framework: Briefly outline the structure of your literature review, indicating how you will categorize and discuss the existing research. 
• Significance of the Study: Highlight why your literature review is important and how it contributes to the understanding of the chosen topic. 
• Thesis Statement: Conclude the introduction with a concise thesis statement that outlines the main argument or perspective you will develop in the body of the literature review. 

Body: The body of the literature review is where you provide a comprehensive analysis of existing literature, grouping studies based on themes, methodologies, or other relevant criteria. 

• Organize by Theme or Concept: Group studies that share common themes, concepts, or methodologies. Discuss each theme or concept in detail, summarizing key findings and identifying gaps or areas of disagreement. 
• Critical Analysis: Evaluate the strengths and weaknesses of each study. Discuss the methodologies used, the quality of evidence, and the overall contribution of each work to the understanding of the topic. 
• Synthesis of Findings: Synthesize the information from different studies to highlight trends, patterns, or areas of consensus in the literature. 
• Identification of Gaps: Discuss any gaps or limitations in the existing research and explain how your review contributes to filling these gaps. 
• Transition between Sections: Provide smooth transitions between different themes or concepts to maintain the flow of your literature review. 

Conclusion: The conclusion of your literature review should summarize the main findings, highlight the contributions of the review, and suggest avenues for future research. 

• Summary of Key Findings: Recap the main findings from the literature and restate how they contribute to your research question or objective. 
• Contributions to the Field: Discuss the overall contribution of your literature review to the existing knowledge in the field. 
• Implications and Applications: Explore the practical implications of the findings and suggest how they might impact future research or practice. 
• Recommendations for Future Research: Identify areas that require further investigation and propose potential directions for future research in the field. 
• Final Thoughts: Conclude with a final reflection on the importance of your literature review and its relevance to the broader academic community. 

Conducting a literature review

Conducting a literature review is an essential step in research that involves reviewing and analyzing existing literature on a specific topic. It’s important to know how to do a literature review effectively, so here are the steps to follow: 1  

Choose a Topic and Define the Research Question:

• Select a topic that is relevant to your field of study. 
• Clearly define your research question or objective. Determine what specific aspect of the topic do you want to explore? 

Decide on the Scope of Your Review:

• Determine the timeframe for your literature review. Are you focusing on recent developments, or do you want a historical overview? 
• Consider the geographical scope. Is your review global, or are you focusing on a specific region? 
• Define the inclusion and exclusion criteria. What types of sources will you include? Are there specific types of studies or publications you will exclude? 

Select Databases for Searches:

• Identify relevant databases for your field. Examples include PubMed, IEEE Xplore, Scopus, Web of Science, and Google Scholar. 
• Consider searching in library catalogs, institutional repositories, and specialized databases related to your topic. 

Conduct Searches and Keep Track:

• Develop a systematic search strategy using keywords, Boolean operators (AND, OR, NOT), and other search techniques. 
• Record and document your search strategy for transparency and replicability. 
• Keep track of the articles, including publication details, abstracts, and links. Use citation management tools like EndNote, Zotero, or Mendeley to organize your references. 

Review the Literature:

• Evaluate the relevance and quality of each source. Consider the methodology, sample size, and results of studies. 
• Organize the literature by themes or key concepts. Identify patterns, trends, and gaps in the existing research. 
• Summarize key findings and arguments from each source. Compare and contrast different perspectives. 
• Identify areas where there is a consensus in the literature and where there are conflicting opinions. 
• Provide critical analysis and synthesis of the literature. What are the strengths and weaknesses of existing research? 

Organize and Write Your Literature Review:

• Literature review outline should be based on themes, chronological order, or methodological approaches. 
• Write a clear and coherent narrative that synthesizes the information gathered. 
• Use proper citations for each source and ensure consistency in your citation style (APA, MLA, Chicago, etc.). 
• Conclude your literature review by summarizing key findings, identifying gaps, and suggesting areas for future research. 

The literature review sample and detailed advice on writing and conducting a review will help you produce a well-structured report. But remember that a literature review is an ongoing process, and it may be necessary to revisit and update it as your research progresses. 

Frequently asked questions

A literature review is a critical and comprehensive analysis of existing literature (published and unpublished works) on a specific topic or research question and provides a synthesis of the current state of knowledge in a particular field. A well-conducted literature review is crucial for researchers to build upon existing knowledge, avoid duplication of efforts, and contribute to the advancement of their field. It also helps researchers situate their work within a broader context and facilitates the development of a sound theoretical and conceptual framework for their studies.

Literature review is a crucial component of research writing, providing a solid background for a research paper’s investigation. The aim is to keep professionals up to date by providing an understanding of ongoing developments within a specific field, including research methods, and experimental techniques used in that field, and present that knowledge in the form of a written report. Also, the depth and breadth of the literature review emphasizes the credibility of the scholar in his or her field.  

Before writing a literature review, it’s essential to undertake several preparatory steps to ensure that your review is well-researched, organized, and focused. This includes choosing a topic of general interest to you and doing exploratory research on that topic, writing an annotated bibliography, and noting major points, especially those that relate to the position you have taken on the topic. 

Literature reviews and academic research papers are essential components of scholarly work but serve different purposes within the academic realm. 3 A literature review aims to provide a foundation for understanding the current state of research on a particular topic, identify gaps or controversies, and lay the groundwork for future research. Therefore, it draws heavily from existing academic sources, including books, journal articles, and other scholarly publications. In contrast, an academic research paper aims to present new knowledge, contribute to the academic discourse, and advance the understanding of a specific research question. Therefore, it involves a mix of existing literature (in the introduction and literature review sections) and original data or findings obtained through research methods. 

Literature reviews are essential components of academic and research papers, and various strategies can be employed to conduct them effectively. If you want to know how to write a literature review for a research paper, here are four common approaches that are often used by researchers.  Chronological Review: This strategy involves organizing the literature based on the chronological order of publication. It helps to trace the development of a topic over time, showing how ideas, theories, and research have evolved.  Thematic Review: Thematic reviews focus on identifying and analyzing themes or topics that cut across different studies. Instead of organizing the literature chronologically, it is grouped by key themes or concepts, allowing for a comprehensive exploration of various aspects of the topic.  Methodological Review: This strategy involves organizing the literature based on the research methods employed in different studies. It helps to highlight the strengths and weaknesses of various methodologies and allows the reader to evaluate the reliability and validity of the research findings.  Theoretical Review: A theoretical review examines the literature based on the theoretical frameworks used in different studies. This approach helps to identify the key theories that have been applied to the topic and assess their contributions to the understanding of the subject.  It’s important to note that these strategies are not mutually exclusive, and a literature review may combine elements of more than one approach. The choice of strategy depends on the research question, the nature of the literature available, and the goals of the review. Additionally, other strategies, such as integrative reviews or systematic reviews, may be employed depending on the specific requirements of the research.

The literature review format can vary depending on the specific publication guidelines. However, there are some common elements and structures that are often followed. Here is a general guideline for the format of a literature review:  Introduction:   Provide an overview of the topic.  Define the scope and purpose of the literature review.  State the research question or objective.  Body:   Organize the literature by themes, concepts, or chronology.  Critically analyze and evaluate each source.  Discuss the strengths and weaknesses of the studies.  Highlight any methodological limitations or biases.  Identify patterns, connections, or contradictions in the existing research.  Conclusion:   Summarize the key points discussed in the literature review.  Highlight the research gap.  Address the research question or objective stated in the introduction.  Highlight the contributions of the review and suggest directions for future research.

Both annotated bibliographies and literature reviews involve the examination of scholarly sources. While annotated bibliographies focus on individual sources with brief annotations, literature reviews provide a more in-depth, integrated, and comprehensive analysis of existing literature on a specific topic. The key differences are as follows: 

References 

• Denney, A. S., & Tewksbury, R. (2013). How to write a literature review.  Journal of criminal justice education ,  24 (2), 218-234. 
• Pan, M. L. (2016).  Preparing literature reviews: Qualitative and quantitative approaches . Taylor & Francis. 
• Cantero, C. (2019). How to write a literature review.  San José State University Writing Center . 

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• University of Texas Libraries

Literature Reviews

• What is a literature review?
• Steps in the Literature Review Process
• Define your research question
• Determine inclusion and exclusion criteria
• Choose databases and search
• Review Results
• Synthesize Results
• Analyze Results
• Librarian Support

What is a Literature Review?

A literature or narrative review is a comprehensive review and analysis of the published literature on a specific topic or research question. The literature that is reviewed contains: books, articles, academic articles, conference proceedings, association papers, and dissertations. It contains the most pertinent studies and points to important past and current research and practices. It provides background and context, and shows how your research will contribute to the field. 

A literature review should: 

• Provide a comprehensive and updated review of the literature;
• Explain why this review has taken place;
• Articulate a position or hypothesis;
• Acknowledge and account for conflicting and corroborating points of view

From  S age Research Methods

Purpose of a Literature Review

A literature review can be written as an introduction to a study to:

• Demonstrate how a study fills a gap in research
• Compare a study with other research that's been done

Or it can be a separate work (a research article on its own) which:

• Organizes or describes a topic
• Describes variables within a particular issue/problem

Limitations of a Literature Review

Some of the limitations of a literature review are:

• It's a snapshot in time. Unlike other reviews, this one has beginning, a middle and an end. There may be future developments that could make your work less relevant.
• It may be too focused. Some niche studies may miss the bigger picture.
• It can be difficult to be comprehensive. There is no way to make sure all the literature on a topic was considered.
• It is easy to be biased if you stick to top tier journals. There may be other places where people are publishing exemplary research. Look to open access publications and conferences to reflect a more inclusive collection. Also, make sure to include opposing views (and not just supporting evidence).

Source: Grant, Maria J., and Andrew Booth. “A Typology of Reviews: An Analysis of 14 Review Types and Associated Methodologies.” Health Information & Libraries Journal, vol. 26, no. 2, June 2009, pp. 91–108. Wiley Online Library, doi:10.1111/j.1471-1842.2009.00848.x.

Meryl Brodsky : Communication and Information Studies

Hannah Chapman Tripp : Biology, Neuroscience

Carolyn Cunningham : Human Development & Family Sciences, Psychology, Sociology

Larayne Dallas : Engineering

Janelle Hedstrom : Special Education, Curriculum & Instruction, Ed Leadership & Policy ​

Susan Macicak : Linguistics

Imelda Vetter : Dell Medical School

For help in other subject areas, please see the guide to library specialists by subject .

Periodically, UT Libraries runs a workshop covering the basics and library support for literature reviews. While we try to offer these once per academic year, we find providing the recording to be helpful to community members who have missed the session. Following is the most recent recording of the workshop, Conducting a Literature Review. To view the recording, a UT login is required.

• October 26, 2022 recording
• Last Updated: Oct 26, 2022 2:49 PM
• URL: https://guides.lib.utexas.edu/literaturereviews

Libraries | Research Guides

Literature reviews, what is a literature review, learning more about how to do a literature review.

• Planning the Review
• The Research Question
• Choosing Where to Search
• Organizing the Review
• Writing the Review

A literature review is a review and synthesis of existing research on a topic or research question. A literature review is meant to analyze the scholarly literature, make connections across writings and identify strengths, weaknesses, trends, and missing conversations. A literature review should address different aspects of a topic as it relates to your research question. A literature review goes beyond a description or summary of the literature you have read. 

• Sage Research Methods Core Collection This link opens in a new window SAGE Research Methods supports research at all levels by providing material to guide users through every step of the research process. SAGE Research Methods is the ultimate methods library with more than 1000 books, reference works, journal articles, and instructional videos by world-leading academics from across the social sciences, including the largest collection of qualitative methods books available online from any scholarly publisher. – Publisher

• Next: Planning the Review >>
• Last Updated: Jan 17, 2024 10:05 AM
• URL: https://libguides.northwestern.edu/literaturereviews

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• What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

• Quick Run-through
• Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and scholarly context
• Develop a theoretical framework and methodology for your research
• Position yourself in relation to other researchers and theorists
• Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

Prevent plagiarism, run a free check.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

• Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
• Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
• Critically evaluate: mention the strengths and weaknesses of your sources.
• Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarise yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

Cite this Scribbr article

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• Correction 09 December 2020

How to write a superb literature review

Andy Tay is a freelance writer based in Singapore.

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Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.

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Correction 09 December 2020 : An earlier version of the tables in this article included some incorrect details about the programs Zotero, Endnote and Manubot. These have now been corrected.

Hsing, I.-M., Xu, Y. & Zhao, W. Electroanalysis 19 , 755–768 (2007).

Article   Google Scholar  

Ledesma, H. A. et al. Nature Nanotechnol. 14 , 645–657 (2019).

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Organizing Your Social Sciences Research Paper

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A literature review surveys prior research published in books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated. Literature reviews are designed to provide an overview of sources you have used in researching a particular topic and to demonstrate to your readers how your research fits within existing scholarship about the topic.

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . Fourth edition. Thousand Oaks, CA: SAGE, 2014.

Importance of a Good Literature Review

A literature review may consist of simply a summary of key sources, but in the social sciences, a literature review usually has an organizational pattern and combines both summary and synthesis, often within specific conceptual categories . A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information in a way that informs how you are planning to investigate a research problem. The analytical features of a literature review might:

• Give a new interpretation of old material or combine new with old interpretations,
• Trace the intellectual progression of the field, including major debates,
• Depending on the situation, evaluate the sources and advise the reader on the most pertinent or relevant research, or
• Usually in the conclusion of a literature review, identify where gaps exist in how a problem has been researched to date.

Given this, the purpose of a literature review is to:

• Place each work in the context of its contribution to understanding the research problem being studied.
• Describe the relationship of each work to the others under consideration.
• Identify new ways to interpret prior research.
• Reveal any gaps that exist in the literature.
• Resolve conflicts amongst seemingly contradictory previous studies.
• Identify areas of prior scholarship to prevent duplication of effort.
• Point the way in fulfilling a need for additional research.
• Locate your own research within the context of existing literature [very important].

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper. 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . Los Angeles, CA: SAGE, 2011; Knopf, Jeffrey W. "Doing a Literature Review." PS: Political Science and Politics 39 (January 2006): 127-132; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012.

Types of Literature Reviews

It is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the primary studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally among scholars that become part of the body of epistemological traditions within the field.

In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews. Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are a number of approaches you could adopt depending upon the type of analysis underpinning your study.

Argumentative Review This form examines literature selectively in order to support or refute an argument, deeply embedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to make summary claims of the sort found in systematic reviews [see below].

Integrative Review Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses or research problems. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication. This is the most common form of review in the social sciences.

Historical Review Few things rest in isolation from historical precedent. Historical literature reviews focus on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review A review does not always focus on what someone said [findings], but how they came about saying what they say [method of analysis]. Reviewing methods of analysis provides a framework of understanding at different levels [i.e. those of theory, substantive fields, research approaches, and data collection and analysis techniques], how researchers draw upon a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection, and data analysis. This approach helps highlight ethical issues which you should be aware of and consider as you go through your own study.

Systematic Review This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyze data from the studies that are included in the review. The goal is to deliberately document, critically evaluate, and summarize scientifically all of the research about a clearly defined research problem . Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?" This type of literature review is primarily applied to examining prior research studies in clinical medicine and allied health fields, but it is increasingly being used in the social sciences.

Theoretical Review The purpose of this form is to examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review helps to establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

NOTE : Most often the literature review will incorporate some combination of types. For example, a review that examines literature supporting or refuting an argument, assumption, or philosophical problem related to the research problem will also need to include writing supported by sources that establish the history of these arguments in the literature.

Baumeister, Roy F. and Mark R. Leary. "Writing Narrative Literature Reviews."  Review of General Psychology 1 (September 1997): 311-320; Mark R. Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Kennedy, Mary M. "Defining a Literature." Educational Researcher 36 (April 2007): 139-147; Petticrew, Mark and Helen Roberts. Systematic Reviews in the Social Sciences: A Practical Guide . Malden, MA: Blackwell Publishers, 2006; Torracro, Richard. "Writing Integrative Literature Reviews: Guidelines and Examples." Human Resource Development Review 4 (September 2005): 356-367; Rocco, Tonette S. and Maria S. Plakhotnik. "Literature Reviews, Conceptual Frameworks, and Theoretical Frameworks: Terms, Functions, and Distinctions." Human Ressource Development Review 8 (March 2008): 120-130; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

Structure and Writing Style

I.  Thinking About Your Literature Review

The structure of a literature review should include the following in support of understanding the research problem :

• An overview of the subject, issue, or theory under consideration, along with the objectives of the literature review,
• Division of works under review into themes or categories [e.g. works that support a particular position, those against, and those offering alternative approaches entirely],
• An explanation of how each work is similar to and how it varies from the others,
• Conclusions as to which pieces are best considered in their argument, are most convincing of their opinions, and make the greatest contribution to the understanding and development of their area of research.

The critical evaluation of each work should consider :

• Provenance -- what are the author's credentials? Are the author's arguments supported by evidence [e.g. primary historical material, case studies, narratives, statistics, recent scientific findings]?
• Methodology -- were the techniques used to identify, gather, and analyze the data appropriate to addressing the research problem? Was the sample size appropriate? Were the results effectively interpreted and reported?
• Objectivity -- is the author's perspective even-handed or prejudicial? Is contrary data considered or is certain pertinent information ignored to prove the author's point?
• Persuasiveness -- which of the author's theses are most convincing or least convincing?
• Validity -- are the author's arguments and conclusions convincing? Does the work ultimately contribute in any significant way to an understanding of the subject?

II.  Development of the Literature Review

Four Basic Stages of Writing 1.  Problem formulation -- which topic or field is being examined and what are its component issues? 2.  Literature search -- finding materials relevant to the subject being explored. 3.  Data evaluation -- determining which literature makes a significant contribution to the understanding of the topic. 4.  Analysis and interpretation -- discussing the findings and conclusions of pertinent literature.

Consider the following issues before writing the literature review: Clarify If your assignment is not specific about what form your literature review should take, seek clarification from your professor by asking these questions: 1.  Roughly how many sources would be appropriate to include? 2.  What types of sources should I review (books, journal articles, websites; scholarly versus popular sources)? 3.  Should I summarize, synthesize, or critique sources by discussing a common theme or issue? 4.  Should I evaluate the sources in any way beyond evaluating how they relate to understanding the research problem? 5.  Should I provide subheadings and other background information, such as definitions and/or a history? Find Models Use the exercise of reviewing the literature to examine how authors in your discipline or area of interest have composed their literature review sections. Read them to get a sense of the types of themes you might want to look for in your own research or to identify ways to organize your final review. The bibliography or reference section of sources you've already read, such as required readings in the course syllabus, are also excellent entry points into your own research. Narrow the Topic The narrower your topic, the easier it will be to limit the number of sources you need to read in order to obtain a good survey of relevant resources. Your professor will probably not expect you to read everything that's available about the topic, but you'll make the act of reviewing easier if you first limit scope of the research problem. A good strategy is to begin by searching the USC Libraries Catalog for recent books about the topic and review the table of contents for chapters that focuses on specific issues. You can also review the indexes of books to find references to specific issues that can serve as the focus of your research. For example, a book surveying the history of the Israeli-Palestinian conflict may include a chapter on the role Egypt has played in mediating the conflict, or look in the index for the pages where Egypt is mentioned in the text. Consider Whether Your Sources are Current Some disciplines require that you use information that is as current as possible. This is particularly true in disciplines in medicine and the sciences where research conducted becomes obsolete very quickly as new discoveries are made. However, when writing a review in the social sciences, a survey of the history of the literature may be required. In other words, a complete understanding the research problem requires you to deliberately examine how knowledge and perspectives have changed over time. Sort through other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to explore what is considered by scholars to be a "hot topic" and what is not.

III.  Ways to Organize Your Literature Review

Chronology of Events If your review follows the chronological method, you could write about the materials according to when they were published. This approach should only be followed if a clear path of research building on previous research can be identified and that these trends follow a clear chronological order of development. For example, a literature review that focuses on continuing research about the emergence of German economic power after the fall of the Soviet Union. By Publication Order your sources by publication chronology, then, only if the order demonstrates a more important trend. For instance, you could order a review of literature on environmental studies of brown fields if the progression revealed, for example, a change in the soil collection practices of the researchers who wrote and/or conducted the studies. Thematic [“conceptual categories”] A thematic literature review is the most common approach to summarizing prior research in the social and behavioral sciences. Thematic reviews are organized around a topic or issue, rather than the progression of time, although the progression of time may still be incorporated into a thematic review. For example, a review of the Internet’s impact on American presidential politics could focus on the development of online political satire. While the study focuses on one topic, the Internet’s impact on American presidential politics, it would still be organized chronologically reflecting technological developments in media. The difference in this example between a "chronological" and a "thematic" approach is what is emphasized the most: themes related to the role of the Internet in presidential politics. Note that more authentic thematic reviews tend to break away from chronological order. A review organized in this manner would shift between time periods within each section according to the point being made. Methodological A methodological approach focuses on the methods utilized by the researcher. For the Internet in American presidential politics project, one methodological approach would be to look at cultural differences between the portrayal of American presidents on American, British, and French websites. Or the review might focus on the fundraising impact of the Internet on a particular political party. A methodological scope will influence either the types of documents in the review or the way in which these documents are discussed.

Other Sections of Your Literature Review Once you've decided on the organizational method for your literature review, the sections you need to include in the paper should be easy to figure out because they arise from your organizational strategy. In other words, a chronological review would have subsections for each vital time period; a thematic review would have subtopics based upon factors that relate to the theme or issue. However, sometimes you may need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. However, only include what is necessary for the reader to locate your study within the larger scholarship about the research problem.

Here are examples of other sections, usually in the form of a single paragraph, you may need to include depending on the type of review you write:

• Current Situation : Information necessary to understand the current topic or focus of the literature review.
• Sources Used : Describes the methods and resources [e.g., databases] you used to identify the literature you reviewed.
• History : The chronological progression of the field, the research literature, or an idea that is necessary to understand the literature review, if the body of the literature review is not already a chronology.
• Selection Methods : Criteria you used to select (and perhaps exclude) sources in your literature review. For instance, you might explain that your review includes only peer-reviewed [i.e., scholarly] sources.
• Standards : Description of the way in which you present your information.
• Questions for Further Research : What questions about the field has the review sparked? How will you further your research as a result of the review?

IV.  Writing Your Literature Review

Once you've settled on how to organize your literature review, you're ready to write each section. When writing your review, keep in mind these issues.

Use Evidence A literature review section is, in this sense, just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence [citations] that demonstrates that what you are saying is valid. Be Selective Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the research problem, whether it is thematic, methodological, or chronological. Related items that provide additional information, but that are not key to understanding the research problem, can be included in a list of further readings . Use Quotes Sparingly Some short quotes are appropriate if you want to emphasize a point, or if what an author stated cannot be easily paraphrased. Sometimes you may need to quote certain terminology that was coined by the author, is not common knowledge, or taken directly from the study. Do not use extensive quotes as a substitute for using your own words in reviewing the literature. Summarize and Synthesize Remember to summarize and synthesize your sources within each thematic paragraph as well as throughout the review. Recapitulate important features of a research study, but then synthesize it by rephrasing the study's significance and relating it to your own work and the work of others. Keep Your Own Voice While the literature review presents others' ideas, your voice [the writer's] should remain front and center. For example, weave references to other sources into what you are writing but maintain your own voice by starting and ending the paragraph with your own ideas and wording. Use Caution When Paraphrasing When paraphrasing a source that is not your own, be sure to represent the author's information or opinions accurately and in your own words. Even when paraphrasing an author’s work, you still must provide a citation to that work.

V.  Common Mistakes to Avoid

These are the most common mistakes made in reviewing social science research literature.

• Sources in your literature review do not clearly relate to the research problem;
• You do not take sufficient time to define and identify the most relevant sources to use in the literature review related to the research problem;
• Relies exclusively on secondary analytical sources rather than including relevant primary research studies or data;
• Uncritically accepts another researcher's findings and interpretations as valid, rather than examining critically all aspects of the research design and analysis;
• Does not describe the search procedures that were used in identifying the literature to review;
• Reports isolated statistical results rather than synthesizing them in chi-squared or meta-analytic methods; and,
• Only includes research that validates assumptions and does not consider contrary findings and alternative interpretations found in the literature.

Cook, Kathleen E. and Elise Murowchick. “Do Literature Review Skills Transfer from One Course to Another?” Psychology Learning and Teaching 13 (March 2014): 3-11; Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . London: SAGE, 2011; Literature Review Handout. Online Writing Center. Liberty University; Literature Reviews. The Writing Center. University of North Carolina; Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: SAGE, 2016; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012; Randolph, Justus J. “A Guide to Writing the Dissertation Literature Review." Practical Assessment, Research, and Evaluation. vol. 14, June 2009; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016; Taylor, Dena. The Literature Review: A Few Tips On Conducting It. University College Writing Centre. University of Toronto; Writing a Literature Review. Academic Skills Centre. University of Canberra.

Writing Tip

Break Out of Your Disciplinary Box!

Thinking interdisciplinarily about a research problem can be a rewarding exercise in applying new ideas, theories, or concepts to an old problem. For example, what might cultural anthropologists say about the continuing conflict in the Middle East? In what ways might geographers view the need for better distribution of social service agencies in large cities than how social workers might study the issue? You don’t want to substitute a thorough review of core research literature in your discipline for studies conducted in other fields of study. However, particularly in the social sciences, thinking about research problems from multiple vectors is a key strategy for finding new solutions to a problem or gaining a new perspective. Consult with a librarian about identifying research databases in other disciplines; almost every field of study has at least one comprehensive database devoted to indexing its research literature.

Frodeman, Robert. The Oxford Handbook of Interdisciplinarity . New York: Oxford University Press, 2010.

Another Writing Tip

Don't Just Review for Content!

While conducting a review of the literature, maximize the time you devote to writing this part of your paper by thinking broadly about what you should be looking for and evaluating. Review not just what scholars are saying, but how are they saying it. Some questions to ask:

• How are they organizing their ideas?
• What methods have they used to study the problem?
• What theories have been used to explain, predict, or understand their research problem?
• What sources have they cited to support their conclusions?
• How have they used non-textual elements [e.g., charts, graphs, figures, etc.] to illustrate key points?

When you begin to write your literature review section, you'll be glad you dug deeper into how the research was designed and constructed because it establishes a means for developing more substantial analysis and interpretation of the research problem.

Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1 998.

Yet Another Writing Tip

When Do I Know I Can Stop Looking and Move On?

Here are several strategies you can utilize to assess whether you've thoroughly reviewed the literature:

• Look for repeating patterns in the research findings . If the same thing is being said, just by different people, then this likely demonstrates that the research problem has hit a conceptual dead end. At this point consider: Does your study extend current research?  Does it forge a new path? Or, does is merely add more of the same thing being said?
• Look at sources the authors cite to in their work . If you begin to see the same researchers cited again and again, then this is often an indication that no new ideas have been generated to address the research problem.
• Search Google Scholar to identify who has subsequently cited leading scholars already identified in your literature review [see next sub-tab]. This is called citation tracking and there are a number of sources that can help you identify who has cited whom, particularly scholars from outside of your discipline. Here again, if the same authors are being cited again and again, this may indicate no new literature has been written on the topic.

Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: Sage, 2016; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

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How to Write a Literature Review

What is a literature review.

• What Is the Literature
• Writing the Review

A literature review is much more than an annotated bibliography or a list of separate reviews of articles and books. It is a critical, analytical summary and synthesis of the current knowledge of a topic. Thus it should compare and relate different theories, findings, etc, rather than just summarize them individually. In addition, it should have a particular focus or theme to organize the review. It does not have to be an exhaustive account of everything published on the topic, but it should discuss all the significant academic literature and other relevant sources important for that focus.

This is meant to be a general guide to writing a literature review: ways to structure one, what to include, how it supplements other research. For more specific help on writing a review, and especially for help on finding the literature to review, sign up for a Personal Research Session .

The specific organization of a literature review depends on the type and purpose of the review, as well as on the specific field or topic being reviewed. But in general, it is a relatively brief but thorough exploration of past and current work on a topic. Rather than a chronological listing of previous work, though, literature reviews are usually organized thematically, such as different theoretical approaches, methodologies, or specific issues or concepts involved in the topic. A thematic organization makes it much easier to examine contrasting perspectives, theoretical approaches, methodologies, findings, etc, and to analyze the strengths and weaknesses of, and point out any gaps in, previous research. And this is the heart of what a literature review is about. A literature review may offer new interpretations, theoretical approaches, or other ideas; if it is part of a research proposal or report it should demonstrate the relationship of the proposed or reported research to others' work; but whatever else it does, it must provide a critical overview of the current state of research efforts. 

Literature reviews are common and very important in the sciences and social sciences. They are less common and have a less important role in the humanities, but they do have a place, especially stand-alone reviews.

Types of Literature Reviews

There are different types of literature reviews, and different purposes for writing a review, but the most common are:

• Stand-alone literature review articles . These provide an overview and analysis of the current state of research on a topic or question. The goal is to evaluate and compare previous research on a topic to provide an analysis of what is currently known, and also to reveal controversies, weaknesses, and gaps in current work, thus pointing to directions for future research. You can find examples published in any number of academic journals, but there is a series of Annual Reviews of *Subject* which are specifically devoted to literature review articles. Writing a stand-alone review is often an effective way to get a good handle on a topic and to develop ideas for your own research program. For example, contrasting theoretical approaches or conflicting interpretations of findings can be the basis of your research project: can you find evidence supporting one interpretation against another, or can you propose an alternative interpretation that overcomes their limitations?
• Part of a research proposal . This could be a proposal for a PhD dissertation, a senior thesis, or a class project. It could also be a submission for a grant. The literature review, by pointing out the current issues and questions concerning a topic, is a crucial part of demonstrating how your proposed research will contribute to the field, and thus of convincing your thesis committee to allow you to pursue the topic of your interest or a funding agency to pay for your research efforts.
• Part of a research report . When you finish your research and write your thesis or paper to present your findings, it should include a literature review to provide the context to which your work is a contribution. Your report, in addition to detailing the methods, results, etc. of your research, should show how your work relates to others' work.

A literature review for a research report is often a revision of the review for a research proposal, which can be a revision of a stand-alone review. Each revision should be a fairly extensive revision. With the increased knowledge of and experience in the topic as you proceed, your understanding of the topic will increase. Thus, you will be in a better position to analyze and critique the literature. In addition, your focus will change as you proceed in your research. Some areas of the literature you initially reviewed will be marginal or irrelevant for your eventual research, and you will need to explore other areas more thoroughly. 

Examples of Literature Reviews

See the series of Annual Reviews of *Subject* which are specifically devoted to literature review articles to find many examples of stand-alone literature reviews in the biomedical, physical, and social sciences. 

Research report articles vary in how they are organized, but a common general structure is to have sections such as:

• Abstract - Brief summary of the contents of the article
• Introduction - A explanation of the purpose of the study, a statement of the research question(s) the study intends to address
• Literature review - A critical assessment of the work done so far on this topic, to show how the current study relates to what has already been done
• Methods - How the study was carried out (e.g. instruments or equipment, procedures, methods to gather and analyze data)
• Results - What was found in the course of the study
• Discussion - What do the results mean
• Conclusion - State the conclusions and implications of the results, and discuss how it relates to the work reviewed in the literature review; also, point to directions for further work in the area

Here are some articles that illustrate variations on this theme. There is no need to read the entire articles (unless the contents interest you); just quickly browse through to see the sections, and see how each section is introduced and what is contained in them.

The Determinants of Undergraduate Grade Point Average: The Relative Importance of Family Background, High School Resources, and Peer Group Effects , in The Journal of Human Resources , v. 34 no. 2 (Spring 1999), p. 268-293.

This article has a standard breakdown of sections:

• Introduction
• Literature Review
• Some discussion sections

First Encounters of the Bureaucratic Kind: Early Freshman Experiences with a Campus Bureaucracy , in The Journal of Higher Education , v. 67 no. 6 (Nov-Dec 1996), p. 660-691.

This one does not have a section specifically labeled as a "literature review" or "review of the literature," but the first few sections cite a long list of other sources discussing previous research in the area before the authors present their own study they are reporting.

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Literature Review – Types Writing Guide and Examples

Table of Contents

Literature Review

Definition:

A literature review is a comprehensive and critical analysis of the existing literature on a particular topic or research question. It involves identifying, evaluating, and synthesizing relevant literature, including scholarly articles, books, and other sources, to provide a summary and critical assessment of what is known about the topic.

Types of Literature Review

Types of Literature Review are as follows:

• Narrative literature review : This type of review involves a comprehensive summary and critical analysis of the available literature on a particular topic or research question. It is often used as an introductory section of a research paper.
• Systematic literature review: This is a rigorous and structured review that follows a pre-defined protocol to identify, evaluate, and synthesize all relevant studies on a specific research question. It is often used in evidence-based practice and systematic reviews.
• Meta-analysis: This is a quantitative review that uses statistical methods to combine data from multiple studies to derive a summary effect size. It provides a more precise estimate of the overall effect than any individual study.
• Scoping review: This is a preliminary review that aims to map the existing literature on a broad topic area to identify research gaps and areas for further investigation.
• Critical literature review : This type of review evaluates the strengths and weaknesses of the existing literature on a particular topic or research question. It aims to provide a critical analysis of the literature and identify areas where further research is needed.
• Conceptual literature review: This review synthesizes and integrates theories and concepts from multiple sources to provide a new perspective on a particular topic. It aims to provide a theoretical framework for understanding a particular research question.
• Rapid literature review: This is a quick review that provides a snapshot of the current state of knowledge on a specific research question or topic. It is often used when time and resources are limited.
• Thematic literature review : This review identifies and analyzes common themes and patterns across a body of literature on a particular topic. It aims to provide a comprehensive overview of the literature and identify key themes and concepts.
• Realist literature review: This review is often used in social science research and aims to identify how and why certain interventions work in certain contexts. It takes into account the context and complexities of real-world situations.
• State-of-the-art literature review : This type of review provides an overview of the current state of knowledge in a particular field, highlighting the most recent and relevant research. It is often used in fields where knowledge is rapidly evolving, such as technology or medicine.
• Integrative literature review: This type of review synthesizes and integrates findings from multiple studies on a particular topic to identify patterns, themes, and gaps in the literature. It aims to provide a comprehensive understanding of the current state of knowledge on a particular topic.
• Umbrella literature review : This review is used to provide a broad overview of a large and diverse body of literature on a particular topic. It aims to identify common themes and patterns across different areas of research.
• Historical literature review: This type of review examines the historical development of research on a particular topic or research question. It aims to provide a historical context for understanding the current state of knowledge on a particular topic.
• Problem-oriented literature review : This review focuses on a specific problem or issue and examines the literature to identify potential solutions or interventions. It aims to provide practical recommendations for addressing a particular problem or issue.
• Mixed-methods literature review : This type of review combines quantitative and qualitative methods to synthesize and analyze the available literature on a particular topic. It aims to provide a more comprehensive understanding of the research question by combining different types of evidence.

Parts of Literature Review

Parts of a literature review are as follows:

Introduction

The introduction of a literature review typically provides background information on the research topic and why it is important. It outlines the objectives of the review, the research question or hypothesis, and the scope of the review.

Literature Search

This section outlines the search strategy and databases used to identify relevant literature. The search terms used, inclusion and exclusion criteria, and any limitations of the search are described.

Literature Analysis

The literature analysis is the main body of the literature review. This section summarizes and synthesizes the literature that is relevant to the research question or hypothesis. The review should be organized thematically, chronologically, or by methodology, depending on the research objectives.

Critical Evaluation

Critical evaluation involves assessing the quality and validity of the literature. This includes evaluating the reliability and validity of the studies reviewed, the methodology used, and the strength of the evidence.

The conclusion of the literature review should summarize the main findings, identify any gaps in the literature, and suggest areas for future research. It should also reiterate the importance of the research question or hypothesis and the contribution of the literature review to the overall research project.

The references list includes all the sources cited in the literature review, and follows a specific referencing style (e.g., APA, MLA, Harvard).

How to write Literature Review

Here are some steps to follow when writing a literature review:

• Define your research question or topic : Before starting your literature review, it is essential to define your research question or topic. This will help you identify relevant literature and determine the scope of your review.
• Conduct a comprehensive search: Use databases and search engines to find relevant literature. Look for peer-reviewed articles, books, and other academic sources that are relevant to your research question or topic.
• Evaluate the sources: Once you have found potential sources, evaluate them critically to determine their relevance, credibility, and quality. Look for recent publications, reputable authors, and reliable sources of data and evidence.
• Organize your sources: Group the sources by theme, method, or research question. This will help you identify similarities and differences among the literature, and provide a structure for your literature review.
• Analyze and synthesize the literature : Analyze each source in depth, identifying the key findings, methodologies, and conclusions. Then, synthesize the information from the sources, identifying patterns and themes in the literature.
• Write the literature review : Start with an introduction that provides an overview of the topic and the purpose of the literature review. Then, organize the literature according to your chosen structure, and analyze and synthesize the sources. Finally, provide a conclusion that summarizes the key findings of the literature review, identifies gaps in knowledge, and suggests areas for future research.
• Edit and proofread: Once you have written your literature review, edit and proofread it carefully to ensure that it is well-organized, clear, and concise.

Examples of Literature Review

Here’s an example of how a literature review can be conducted for a thesis on the topic of “ The Impact of Social Media on Teenagers’ Mental Health”:

• Start by identifying the key terms related to your research topic. In this case, the key terms are “social media,” “teenagers,” and “mental health.”
• Use academic databases like Google Scholar, JSTOR, or PubMed to search for relevant articles, books, and other publications. Use these keywords in your search to narrow down your results.
• Evaluate the sources you find to determine if they are relevant to your research question. You may want to consider the publication date, author’s credentials, and the journal or book publisher.
• Begin reading and taking notes on each source, paying attention to key findings, methodologies used, and any gaps in the research.
• Organize your findings into themes or categories. For example, you might categorize your sources into those that examine the impact of social media on self-esteem, those that explore the effects of cyberbullying, and those that investigate the relationship between social media use and depression.
• Synthesize your findings by summarizing the key themes and highlighting any gaps or inconsistencies in the research. Identify areas where further research is needed.
• Use your literature review to inform your research questions and hypotheses for your thesis.

For example, after conducting a literature review on the impact of social media on teenagers’ mental health, a thesis might look like this:

“Using a mixed-methods approach, this study aims to investigate the relationship between social media use and mental health outcomes in teenagers. Specifically, the study will examine the effects of cyberbullying, social comparison, and excessive social media use on self-esteem, anxiety, and depression. Through an analysis of survey data and qualitative interviews with teenagers, the study will provide insight into the complex relationship between social media use and mental health outcomes, and identify strategies for promoting positive mental health outcomes in young people.”

Reference: Smith, J., Jones, M., & Lee, S. (2019). The effects of social media use on adolescent mental health: A systematic review. Journal of Adolescent Health, 65(2), 154-165. doi:10.1016/j.jadohealth.2019.03.024

Reference Example: Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Journal, volume number(issue number), page range. doi:0000000/000000000000 or URL

Applications of Literature Review

some applications of literature review in different fields:

• Social Sciences: In social sciences, literature reviews are used to identify gaps in existing research, to develop research questions, and to provide a theoretical framework for research. Literature reviews are commonly used in fields such as sociology, psychology, anthropology, and political science.
• Natural Sciences: In natural sciences, literature reviews are used to summarize and evaluate the current state of knowledge in a particular field or subfield. Literature reviews can help researchers identify areas where more research is needed and provide insights into the latest developments in a particular field. Fields such as biology, chemistry, and physics commonly use literature reviews.
• Health Sciences: In health sciences, literature reviews are used to evaluate the effectiveness of treatments, identify best practices, and determine areas where more research is needed. Literature reviews are commonly used in fields such as medicine, nursing, and public health.
• Humanities: In humanities, literature reviews are used to identify gaps in existing knowledge, develop new interpretations of texts or cultural artifacts, and provide a theoretical framework for research. Literature reviews are commonly used in fields such as history, literary studies, and philosophy.

Role of Literature Review in Research

Here are some applications of literature review in research:

• Identifying Research Gaps : Literature review helps researchers identify gaps in existing research and literature related to their research question. This allows them to develop new research questions and hypotheses to fill those gaps.
• Developing Theoretical Framework: Literature review helps researchers develop a theoretical framework for their research. By analyzing and synthesizing existing literature, researchers can identify the key concepts, theories, and models that are relevant to their research.
• Selecting Research Methods : Literature review helps researchers select appropriate research methods and techniques based on previous research. It also helps researchers to identify potential biases or limitations of certain methods and techniques.
• Data Collection and Analysis: Literature review helps researchers in data collection and analysis by providing a foundation for the development of data collection instruments and methods. It also helps researchers to identify relevant data sources and identify potential data analysis techniques.
• Communicating Results: Literature review helps researchers to communicate their results effectively by providing a context for their research. It also helps to justify the significance of their findings in relation to existing research and literature.

Purpose of Literature Review

Some of the specific purposes of a literature review are as follows:

• To provide context: A literature review helps to provide context for your research by situating it within the broader body of literature on the topic.
• To identify gaps and inconsistencies: A literature review helps to identify areas where further research is needed or where there are inconsistencies in the existing literature.
• To synthesize information: A literature review helps to synthesize the information from multiple sources and present a coherent and comprehensive picture of the current state of knowledge on the topic.
• To identify key concepts and theories : A literature review helps to identify key concepts and theories that are relevant to your research question and provide a theoretical framework for your study.
• To inform research design: A literature review can inform the design of your research study by identifying appropriate research methods, data sources, and research questions.

Characteristics of Literature Review

Some Characteristics of Literature Review are as follows:

• Identifying gaps in knowledge: A literature review helps to identify gaps in the existing knowledge and research on a specific topic or research question. By analyzing and synthesizing the literature, you can identify areas where further research is needed and where new insights can be gained.
• Establishing the significance of your research: A literature review helps to establish the significance of your own research by placing it in the context of existing research. By demonstrating the relevance of your research to the existing literature, you can establish its importance and value.
• Informing research design and methodology : A literature review helps to inform research design and methodology by identifying the most appropriate research methods, techniques, and instruments. By reviewing the literature, you can identify the strengths and limitations of different research methods and techniques, and select the most appropriate ones for your own research.
• Supporting arguments and claims: A literature review provides evidence to support arguments and claims made in academic writing. By citing and analyzing the literature, you can provide a solid foundation for your own arguments and claims.
• I dentifying potential collaborators and mentors: A literature review can help identify potential collaborators and mentors by identifying researchers and practitioners who are working on related topics or using similar methods. By building relationships with these individuals, you can gain valuable insights and support for your own research and practice.
• Keeping up-to-date with the latest research : A literature review helps to keep you up-to-date with the latest research on a specific topic or research question. By regularly reviewing the literature, you can stay informed about the latest findings and developments in your field.

Advantages of Literature Review

There are several advantages to conducting a literature review as part of a research project, including:

• Establishing the significance of the research : A literature review helps to establish the significance of the research by demonstrating the gap or problem in the existing literature that the study aims to address.
• Identifying key concepts and theories: A literature review can help to identify key concepts and theories that are relevant to the research question, and provide a theoretical framework for the study.
• Supporting the research methodology : A literature review can inform the research methodology by identifying appropriate research methods, data sources, and research questions.
• Providing a comprehensive overview of the literature : A literature review provides a comprehensive overview of the current state of knowledge on a topic, allowing the researcher to identify key themes, debates, and areas of agreement or disagreement.
• Identifying potential research questions: A literature review can help to identify potential research questions and areas for further investigation.
• Avoiding duplication of research: A literature review can help to avoid duplication of research by identifying what has already been done on a topic, and what remains to be done.
• Enhancing the credibility of the research : A literature review helps to enhance the credibility of the research by demonstrating the researcher’s knowledge of the existing literature and their ability to situate their research within a broader context.

Limitations of Literature Review

Limitations of Literature Review are as follows:

• Limited scope : Literature reviews can only cover the existing literature on a particular topic, which may be limited in scope or depth.
• Publication bias : Literature reviews may be influenced by publication bias, which occurs when researchers are more likely to publish positive results than negative ones. This can lead to an incomplete or biased picture of the literature.
• Quality of sources : The quality of the literature reviewed can vary widely, and not all sources may be reliable or valid.
• Time-limited: Literature reviews can become quickly outdated as new research is published, making it difficult to keep up with the latest developments in a field.
• Subjective interpretation : Literature reviews can be subjective, and the interpretation of the findings can vary depending on the researcher’s perspective or bias.
• Lack of original data : Literature reviews do not generate new data, but rather rely on the analysis of existing studies.
• Risk of plagiarism: It is important to ensure that literature reviews do not inadvertently contain plagiarism, which can occur when researchers use the work of others without proper attribution.

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• Academic Skills
• Reading, writing and referencing
• Literature reviews

Writing a literature review

Find out how to write a lit review.

What is a literature review ?

A literature review explores and evaluates the literature on a specific topic or question. It synthesises the contributions of the different authors, often to identify areas that need further exploration.

You may be required to write a literature review as a standalone document or part of a larger body of research, such as a thesis.

• The point of a standalone literature review is to demonstrate that you have read widely in your field and you understand the main arguments.
• As part of a thesis or research paper, the literature review defines your project by establishing how your work will extend or differ from previous work and what contribution it will make.

What are markers looking for?

In the best literature reviews, the writer:

• Has a clear understanding of key concepts within the topic.
• Clarifies important definitions and terminology.
• Covers the breadth of the specific topic.
• Critically discusses the ideas in the literature and evaluates how authors present them.
• Clearly indicates a research gap for future enquiry.

How do I write a literature review?

This video outlines a step by step approach to help you evaluate readings, organise ideas and write critically. It provides examples of how to connect, interpret and critique ideas to make sure your voice comes through strongly.

Tips for research, reading and writing

You may be given a specific question to research or broad topics which must be refined to a question that can be reasonably addressed in the time and word limit available.

Use your early reading to help you determine and refine your topic.

• Too much literature? You probably need to narrow your scope. Try to identify a more specific issue of interest.
• Not enough literature? Your topic may be too specific and needs to be broader.

Start with readings suggested by your lecturers or supervisors. Then, do your own research - the best place to go is the Library Website .

You can also use the Library Guides or speak to a librarian to identify the most useful databases for you and to learn how to search for sources effectively and efficiently.

Cover the field

Make sure your literature search covers a broad range of views and information relevant to your topic. Focussing on a narrow selection of sources may result in a lack of depth. You are not expected to cover all research and scholarly opinions on your topic, but you need to identify and include important viewpoints. A quality literature review examines and evaluates different viewpoints based on the evidence presented, rather than providing only material that reinforces a bias.

Use reading strategies

Survey, skim and scan to find the most relevant articles, and the most relevant parts of those articles. These can be re-read more closely later when you have acquired an overview of your topic.

Take notes as you read

This helps to organise and develop your thoughts. Record your own reactions to the text in your notes, perhaps in a separate column. These notes can form the basis of your critical evaluation of the text. Record any facts, opinions or direct quotes that are likely to be useful to your review, noting the page numbers, author and year.

Stop reading when you have enough

This depends on the word count required of this literature review. A review of one thousand words can only cover the major ideas and probably less than ten references. Longer reviews that form part of a large research paper will include more than fifty. Your tutor or supervisor should be able to suggest a suitable number.

As you read, ask yourself these questions:

• Have I answered my question without any obvious gaps?
• Have I read this before? Are there any new related issues coming up as I search the literature?
• Have I found multiple references which cover the same material or just enough to prove agreement?

There are many possible ways to organise the material. For example:

• chronologically
• by theoretical perspective
• from most to least important
• by issue or theme

It is important to remember that you are not merely cataloguing or describing the literature you read. Therefore, you need to choose an organisation that will enable you to compare the various authors' treatment of ideas. This is often best achieved by organising thematically, or grouping ideas into sets of common issues tackled in the various texts. These themes will form the basis of the different threads that are the focus of your study.

A standalone literature review

A standalone literature review is structured much like an academic essay.

• Introduction - establish the context for your topic and outline your main contentions about the literature
• Main body - explain and support these inferences in the main body
• Conclusion - summarise your main points and restate the contention.

The main difference between an essay and this kind of literature review is that an essay focuses on a topic and uses the literature as a support for the arguments. In a standalone literature review, the literature itself is the topic of discussion and evaluation. This means you evaluate and discuss not only the informational content but the quality of the author’s handling of the content.

A literature review as part of a larger research paper?

As part of a larger research paper, the literature review may take many forms, depending on your discipline, your topic and the logic of your research. Traditionally, in empirical research, the literature review is included in the introduction, or a standalone chapter immediately following the introduction. For other forms of research, you may need to engage more extensively with the literature and thus, the literature review may spread over more than one chapter, or even be distributed throughout the thesis.

Start writing early. Writing will clarify your thinking on the topic and reveal any gaps in information and logic. If your ideas change, sections and paragraphs can be reworked to change your contentions or include extra information.

Similarly, draft an overall plan for your review as soon as you are ready, but be prepared to rework sections of it to reflect your developing argument.

The most important thing to remember is that you are writing a review . That means you must move past describing what other authors have written by connecting, interpreting and critiquing their ideas and presenting your own analysis and interpretation.

Looking for one-on-one advice?

Get tailored advice from an Academic Skills Adviser by booking an Individual appointment, or get quick feedback from one of our Academic Writing Mentors via email through our Writing advice service.

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MINI REVIEW article

Intertemporal prosocial behavior: a review and research agenda.

• 1 Department of Management and Engineering, Division of Economics, Linköping University, Linköping, Sweden
• 2 Department of Health, Medicine and Caring Sciences (HMV), The National Center for Priority Setting in Health Care, Linköping University, Linköping, Sweden
• 3 Department of Behavioural Sciences and Learning, Linköping University, Linköping, Sweden
• 4 Decision Research, Eugene, OR, United States

Research on intertemporal and prosocial decisions has largely developed in separate strands of literature. However, many of the decisions we make occur at the intersection of these two dimensions (intertemporal and prosocial). Trust is an example, where a decision today is made with the expectation that another person will reciprocate (or betray) later. A new literature is emerging to explore the role of time in these types of situations, where time and social considerations are intertwined. In many cases, time introduces (or magnifies) an element of uncertainty about future outcomes and utility that people need to deal with – what will happen, how good will it be, how will it feel. We review this emerging literature on intertemporal prosocial decision-making and discuss how new research can fill existing knowledge gaps.

1 Introduction

Time is a fundamental component in human behavior and interaction. Decisions, desires, views, experiences, and emotions act on and play out over time. Social norms evolve. Societies change. For these reasons, studying how prosocial decisions (here interpreted broadly as decisions affecting and being affected by others) are shaped by time, using controlled experiments, and developing theory, seems important. However, historically this perspective has received little attention. The literatures on intertemporal and prosocial decisions, although each large and vibrant, have mostly developed without significant transfer between them.

Lately, this perplexing isolation between research fields has begun to change. A new literature is emerging at the intersection of temporal and prosocial behavior. What “prosocial” brings to the table here is, primarily, that these decisions often involve a strategic component, where outcomes depend on decisions and expectations by more than one individual; and are to a greater degree influenced by context, norms, personal and social identity. These aspects of decision-making are amenable to time. For example, if people have different motivations for delayed rewards (discounting), then simply adding a time delay to a classic bargaining- or coordination game may substantially change the strategic landscape (and the corresponding game predictions).

Here, we review this emerging literature on intertemporal prosocial decision-making and discuss several promising directions for new research.

2 Emerging literature on intertemporal prosocial decision-making

The core research strategy for most papers in this emerging field has been to add a time delay to a standard prosocial decision-context normally run in the lab, e.g., a trust-, cooperation-, coordination-, or bargaining game. This has produced some thought-provoking findings and predictions, including that small differences in time preference may improve coordination and influence bargaining power (about resource distribution), but also that time may act as a barrier to cooperation. Moreover, initial results indicate that trust and trustworthiness is surprisingly robust to time delay, at least for short delays, and that altruism follows a different intertemporal pattern compared to decisions that are purely personal, including absence of classical time-inconsistent choosing.

Agranov et al. (2023) investigated how differential time preferences influenced coordination. They used a standard protocol for repeated coordination, where participants make decisions over many rounds and continuation is probabilistic. Interestingly, allowing for even a small difference in time preference influenced outcomes (fewer coordination failures), likely working as a coordination anchor; and larger differences gave rise to intertemporal trades, where individuals with steeper discounting received higher payoffs early on, and vice versa for individuals with less steep discounting.

Kim et al. (2023) used a similar approach allowing for discounting differentials to investigate the effect on bargaining behavior. In their experiment, participants bargained repeatedly (submitting alternating offers) about how to share a fix sum of money. Any offer that was rejected triggered a new round of bargaining but also pushed eventual payout further into the future. Here, patience is strategically relevant since it is less costly for more patient players to ‘wait’ for a good offer. Theoretically, opposing players who are less patient should recognize and submit better offers upfront. The results showed that players who faced a longer payoff delay (thus steeper effective discounting) indeed submitted less demanding proposals and enjoyed less favorable outcomes overall.

Two papers investigated the effects of time delay on cooperation. Kim (2023) incorporated time delay in payoffs in a repeated prisoner’s dilemma game. They used a classic repeated-games framework but with the temporal sequence of stage games mapped to staggered payouts for weeks or months, rather than all at once received immediately at the end of the experiment. There was lower cooperation when payoffs were delayed more, thus indicating that steeper discounting decreases cooperation in a repeated games framework. Kölle and Laurer (2024) investigated the effects of time delay on various payoff components in a linear public goods game. In the classic version of this game, participants can keep money for themselves or contribute to a common account that benefits everyone in the group. The parameters are usually set such that it is individually optimal for selfish persons to keep all money for themselves, but socially optimal if everyone contributes fully to the group account. Here, the authors systematically varied which type of benefit (personal, group, none, or both) that was paid immediately and which was paid with a 1 year delay. They found overall substantially lower cooperation rates when group benefits were delayed, and, conversely, increased cooperation when personal benefits were delayed instead. Together these studies suggest that time may act as a barrier to cooperation in the context of solving collective problems, like climate change.

Ederer and Schneider (2022) introduced a time dimension in the classic trust game. Unlike the papers surveyed above, here they kept delay to payout constant but instead systematically varied delay to decision. In the trust game, one player (the ‘trustor’) is given a sum of money and decides how much to send to another player, the ‘trustee.’ The amount sent is multiplied and then the trustee decides how much, if anything, to return to the trustor. Using a variant of this game, Ederer and Schneider introduced delay to the trustee’s decision. Participants as trustors thus decided how much to send to their assigned trustees knowing that the trustee would make their decisions either immediately, 1 day after the experiment, or in 3 weeks’ time. They speculate that trustees’ potential feelings of obligation or guilt might decrease as temporal distance (time since trustor’s decision) increases, and as a result, observed trustworthiness and trust should decrease. However, neither trust nor trustworthiness changed substantially for the delays considered in the experiment (max 3 weeks).

Finally, some papers have investigated the temporal dimension of altruistic behavior. Kölle and Wenner (2023) studied how people allocate effort (for payment) for themselves and others inside a time window of 3 weeks, using a task developed to measure time inconsistency ( Augenblick et al., 2015 ). In short, time inconsistency here means disproportionate valuation of rewards that are immediately available. The novel idea here was that people made temporal allocations not only for themselves but also for others and in particular for self vs. other. In line with previous literature (non-social decisions), they found evidence of time inconsistency when choosing for oneself. However, these results did not extend to choices for others or for self-other tradeoffs. The authors concluded that discounting in social situations appears to be conceptually different from personal discounting. Chopra et al. (2024) also investigated the temporal structure of self-other tradeoffs but used a different design, with substantially longer time frames (up to 1 year) and monetary donations to charity. Interestingly, they found that prosocial decisions in the form of self-other tradeoffs had a distinct temporal profile beyond people’s discounting in either domain (self and other when considered separately) and controlling for their atemporal preference for giving in this context. The authors interpreted this as the upshot of a conceptual distinction between temporal utility flows from consequences vs. choices ( Kovarik, 2009 ; Andreoni and Serra-Garcia, 2021 on the role of time in altruistic behavior).

3 Recent advances in the intertemporal choice literature

Discounting of future monetary rewards is probably one of the most well-researched topics in behavioral social science, and the literature is very active. Over the years a number of stylized patterns have been documented using experiments, e.g., hyperbolicity (i.e., insensitivity to the length of time intervals) and present bias (i.e., disproportionate valuation of immediate rewards), and different theories have been developed to explain them (see, e.g., review by Cohen et al., 2020 ). Traditionally, most of these explanations have focused on motivational factors – deep preference for sooner rewards, self-control failures, impulsivity ( Enke et al., 2023 ).

Interestingly, a newer set of papers has emphasized and begun to formalize temporal discounting from a different explanatory perspective, resulting from ‘cognitive noise’ or decision complexity. Gabaix and Laibson (2022) model temporal discounting as resulting from internal uncertainty about value of future events. Decision makers handle this uncertainty by generating noisy mental simulations of future value, which they combine with their prior beliefs. If noise increases with the horizon (time to delivery) this produces a classic discounting pattern, where future rewards are valued less, even for agents who have no real time preference. Vieider (2021) develops a discounting model based on a similar type of cognitive micro-foundation and Bayesian updating approach, except uncertainty here is tied to perception of time delay rather than future utilities. Gershman and Bhui (2020) extend Gabaix and Laibson’s baseline model to account for adaptive simulation noise. Assuming that attention to signals (mental representations of future utility) is costly, people will “think harder” when potential utility is larger and thus appear to adapt their discounting to reward magnitude, which reproduces a stylized discounting pattern known as ‘the magnitude effect.’ Enke et al. (2023) and Enke and Graeber (2023) operate along the same lines but also make a broader methodological point, noting that temporal choices belong to a class of complex decision problems where people may be reluctant, or unable, to engage in the type of cognitive operations required for optimal choice, and rather resort to simpler decision rules. And many of these rules will produce choice patterns that look like classic discounting even when this is not the underlying value guiding people’s choices.

These developments in the intertemporal choice literature may prove useful for understanding how prosocial decisions are made in an intertemporal context. Because both dimensions (intertemporal and prosocial, respectively) can be conceptualized in terms of mental perspective taking, focusing on current vs. future, or self vs. other. This idea is already a conceptual cornerstone for prosocial decisions, where it is important to understand how somebody else will feel, think, and react, and thus well aligned with the idea (echoed by some of the papers reviewed above) that intertemporal choices are influenced by the extent to which people can understand how something will be or play out in the future.

4 Research agenda

This new literature on intertemporal prosocial decision-making is just emerging and there are many open questions to address. A first line of inquiry should build on the ideas introduced in the papers written so far, where the focus has been to explore how an added time dimension changes the strategic landscape and what observable effects this may have on behavior. This is an exciting topic where much more research is needed, both to replicate patterns that emerged from the few existing studies and to extend to other contexts.

A second aspect to explore is temporal direction; what happens if decisions are extending into the past compared to into the future? Of course, answering this question will require some elaborate experimental-design work, but it is an important perspective to consider. It applies to most games where decisions (thus not only outcomes) are detached in time. The trust game is an example, where the trustor sees to the future but the trustee sees to the past. Conceptually it is not evident that the past and the future are symmetrically perceived. For instance, whereas the present can be experienced, the past and the future have to be mentally constructed ( Trope and Liberman, 2010 ). The source of these construals will be based on memory and imagination (prediction), the past, arguably, to a greater extent on memory, and the future on prediction ( Schacter et al., 2017 ). Down the line there will be interesting connections to be made with literatures on motivated memory and experience-based prediction.

A third, more fundamental task is to start building a conceptual home ground for prosocial decision-making in a temporal context. There is currently no established, unifying conceptual framework. This is not surprising, given that both temporal and prosocial decision-making are complex matters on their own, with a host of different theories existing in either domain, and these theories often rest on different psychological and neural foundations. However, eventually we need to break new ground here. A valuable first step in this process would be to shift focus a little bit by starting to collect large amounts of data within subjects, with the goal of building, and eventually estimating, temporal profiles of prosocial behavior in different contexts. The blueprint would be a densely populated (many different delays) delay discounting task adapted to prosocial choices. These profiles would then form the basis for exploring the effects of different experimental manipulations or looking for differences related to quantitative trait.

Going forward, one possible way to bridge the divide between prior separate conceptualizations of prosocial and temporal choice is to look to new conceptual work in the intertemporal choice literature (reviewed in short above), which emphasizes the role of noisy cognition (and decision complexity) in temporal discounting. One interesting line of thinking here is that decision makers may try to resolve uncertainty about the future by using mental simulations (what will happen, how good will it be, how will I feel), and that this results in temporal discounting. The focus on mental perspective-taking (mental simulations) for temporal decisions is key here because it is conceptually well aligned with the type of cognitive processes we typically attribute to prosocial decisions – “mentalizing” about what we believe other persons will do, how they will feel, what they expect from us, and so on ( Chang et al., 2023 ). This suggests a basic hypothesis about shared substrates in mental perspective taking that are relevant for prosocial decision-making in an intertemporal context. There are many ways in which new research could seek more evidence for (or refute) this hypothesis. One way would be to systematically manipulate temporal distance using episodic time cues ( Peters and Büchel, 2010 ) or emotional salience, e.g., fear of betrayal in the trust game, which should both have a predictable temporal component in their influence on behavior. Ideally this approach is then combined with a search for underlying neural mechanisms, which we touch on briefly below.

An emerging hypothesis in decision neuroscience is that overlapping brain networks are involved in both prosocial and intertemporal decisions. Correlational studies using functional magnetic resonance imaging (fMRI) have shown that a specific set of brain areas are consistently activated for prosocial decisions, often referred to as the social brain network (or the mentalizing network) ( Alós-Ferrer and Farolfi, 2019 ; Chang et al., 2023 ). A key functionality facilitated by this network is the cognitive ability to understand and predict other persons’ intentions, beliefs, and actions; a form of mental perspective taking that is crucial for beneficial social interaction. Of note, a similar type of functionality (using a shared neural implementation) is thought to be operating also in temporal decisions ( Soutschek et al., 2016 ). Here the hypothesis is that the mentalizing network enables future perspective taking, thus influencing the extent to which the future is valued, from today’s perspective. This points to a novel mechanism that is quite different from classic temptation/self-control models of intertemporal choice.

Current thinking is that the regions involved in prosocial or temporal decision-making (e.g., the temporoparietal junction or the partially overlapping angular gyrus) provide higher-order cognitive functions that facilitate integration of multisensory input, and that this functionality is particularly useful when building mental representations of complex phenomena, like social context or temporal projection ( Jung et al., 2022 ; Humphreys and Tibon, 2023 ; Lugrin et al., 2023 ). Consistent with this conceptualization, Pietrzak et al. (2023) found that neural activity in angular gyrus and surrounding areas correlated with decisions in a standard temporal discounting task. An interesting and important avenue for future research is thus to establish the casual role (and connectivity) of key regions in the mentalizing network for prosocial decisions made in a temporal context.

5 Discussion

An exciting new literature is emerging at the intersection of temporal and prosocial decision-making. Our review highlighted directions this literature is taking and we discussed knowledge gaps to be filled by future research. Most of our focus was on the need for in-depth understanding of decisions and underlying processes, including unifying conceptualization. Ultimately such deeper understanding will be needed for extrapolating findings to the world outside the experimental lab. And this is where this new literature becomes relevant for real – because the intertemporal prosocial dimension is present in some of today’s biggest societal challenges. How to find behavioral solutions that can speed up climate change mitigation is perhaps the clearest example. Time is important here because costs will be borne now and benefits in the future. Same for health policy, which discounts the lives of future generations. And both of these decisions are made in a social context.

In the behavioral social-science literature, bottom-up climate change mitigation is often cast in a cooperation/social-dilemma type of framework. Here, the key problem for mitigation is the tension that exists between individually optimal behavior (selfishness) and socially optimal behavior (full cooperation). An important question for policy is therefore how to make people more cooperative, and when it comes to environment this often means increase willingness to bear personal costs of climate-friendly actions incurred today (e.g., price, effort, comfort) for common benefits at some point in the future. As noted by the few papers we surveyed on this topic above, time is important to consider here because willingness to cooperate is plausibly influenced by when the benefit (e.g., global warming kept below 1.5°C) is expected to materialize, or when everyone else make their decisions (e.g., overexploitation is often temporally detached among different actors). More research here can help us design better interventions to tackle these problems.

Of course, climate action is not the only topic where understanding the role of time is important. Motivated beliefs, teamwork, trust, economic hold-up are other examples where social outcomes are plausibly shaped by time. We anticipate new exciting research on these and other topics over the coming years, as the emerging literature on intertemporal prosocial choice continues to grow.

For policymaking, the question how to think about time in prosocial decision-making is not only relevant from a behavioral-descriptive point of view; it is also a highly normative matter, which has consequences for the well-being of both current and future generations. Increased knowledge about when and why time shapes behavior and preferences for policy is just a first step when discussing the more fundamental question of when and why time preferences should shape behavior and public policy. How prosocial choices are shaped by time in an intergenerational context is also a question of utmost importance not only for future generations but for the structure of governance if modern democracy as a mechanism for public decision-making is insufficiently sensitive to the concerns of future generations.

Author contributions

EP: Writing – original draft, Conceptualization. GT: Writing – review & editing, Conceptualization. DV: Writing – review & editing, Conceptualization.

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Agranov, M., Kim, J., and Yariv, L. (2023). Coordination with Differential Time Preferences: Experimental Evidence. CESifo Working Paper 10454. Available at: https://ideas.repec.org/p/ces/ceswps/_10454.html (Accessed March 29, 2024).

Google Scholar

Alós-Ferrer, C., and Farolfi, F. (2019). Trust games and beyond. Front. Neurosci. 13:887. doi: 10.3389/fnins.2019.00887

PubMed Abstract | Crossref Full Text | Google Scholar

Andreoni, J., and Serra-Garcia, M. (2021). Time inconsistent charitable giving. J. Public Econ. 198:104391. doi: 10.1016/j.jpubeco.2021.104391

Crossref Full Text | Google Scholar

Augenblick, N., Niederle, M., and Sprenger, C. (2015). Working over time: dynamic inconsistency in real effort tasks. Q. J. Econ. 130, 1067–1115. doi: 10.1093/qje/qjv020

Chang, L.-A., Armaos, K., Warns, L., Ma de Sousa, A. Q., Paauwe, F., Scholz, C., et al. (2023). Mentalizing in an economic games context is associated with enhanced activation and connectivity in the left temporoparietal junction. Soc. Cogn. Affect. Neurosci. 18:nsad023. doi: 10.1093/scan/nsad023

Chopra, F., Falk, A., and Graeber, T. (2024). Intertemporal altruism. Am. Econ. J. Microeconomics 16, 329–357. doi: 10.1257/mic.20210319

Cohen, J. D., Ericson, K. M., Laibson, D., and White, J. M. (2020). Measuring time preferences. J. Econ. Lit. 58, 299–347. doi: 10.1257/jel.20191074

Ederer, F., and Schneider, F. (2022). Trust and promises over time. Am Econ J Microeconomics 14, 304–320. doi: 10.1257/mic.20200049

Enke, B., and Graeber, T. (2023). Cognitive uncertainty. Q. J. Econ. 138, 2021–2067. doi: 10.1093/qje/qjad025

Enke, B., Graeber, T., and Oprea, R. (2023). Complexity and Time. NBER Working Paper.

Gabaix, X., and Laibson, D. (2022). Myopia and Discounting. NBER Working Paper.

Gershman, S. J., and Bhui, R. (2020). Rationally inattentive intertemporal choice. Nature. Communications 11:3365. doi: 10.1038/s41467-020-16852-y

Humphreys, G. F., and Tibon, R. (2023). Dual-axes of functional organisation across lateral parietal cortex: the angular gyrus forms part of a multi-modal buffering system. Brain Struct. Funct. 228, 341–352. doi: 10.1007/s00429-022-02510-0

Jung, H., Wager, T. D., and Carter, R. M. (2022). Novel cognitive functions arise at the convergence of macroscale gradients. J. Cogn. Neurosci. 34, 381–396. doi: 10.1162/jocn_a_01803

Kim, J. (2023). The effects of time preferences on cooperation: experimental evidence from infinitely repeated games. Am Econ J Microeconomics 15, 618–637. doi: 10.1257/mic.20200195

Kim, J., Lim, W., and Schweighofer-Kodritsch, S. (2023). Patience Is Power: Bargaining and Payoff Delay. Hertie School Working Paper.

Kölle, F., and Laurer, T. (2024). Understanding cooperation in an intertemporal context. Manag. Sci. doi: 10.1287/mnsc.2020.03757

Kölle, F., and Wenner, L. (2023). Is generosity time-inconsistent? Present bias across individual and social contexts. Rev. Econ. Stat. 105, 683–699. doi: 10.1162/rest_a_01049

Kovarik, J. (2009). Giving it now or later: altruism and discounting. Econ. Lett. 102, 152–154. doi: 10.1016/j.econlet.2008.12.005

Lugrin, C., Konovalov, A., and Ruff, C. (2023). Salience-based information aggregation: an overarching function of the “social brain”? bioRxiv . doi: 10.1101/2023.01.30.525877

Peters, J., and Büchel, C. (2010). Episodic future thinking reduces reward delay discounting through an enhancement of prefrontal-mediotemporal interactions. Neuron 66, 138–148. doi: 10.1016/j.neuron.2010.03.026

Pietrzak, M., Yngve, A., Hamilton, P., Kämpe, R., Boehme, R., Asratian, A., et al. (2023). A randomized controlled experimental medicine study of ghrelin in value-based decision making. J. Clin. Invest. 133:e168260. doi: 10.1172/JCI168260

Schacter, D. L., Benoit, R. G., and Szpunar, K. K. (2017). Episodic future thinking: mechanisms and functions. Curr. Opin. Behav. Sci. 17, 41–50. doi: 10.1016/j.cobeha.2017.06.002

Soutschek, A., Ruff, C. C., Strombach, T., Kalenscher, T., and Tobler, P. N. (2016). Brain stimulation reveals crucial role of overcoming self-centeredness in self-control. Sci. Adv. 2:e1600992. doi: 10.1126/sciadv.1600992

Trope, Y., and Liberman, N. (2010). Construal-level theory of psychological distance. Psychol. Rev. 117, 440–463. doi: 10.1037/a0018963

Vieider, F. (2021). Noisy Coding of Time and Reward Discounting. Ghent University Faculty of Economics and Business Administration Working Paper 21/1036. Available at: https://ideas.repec.org/p/rug/rugwps/21-1036.html (Accessed March 29, 2024).

Keywords: prosocial behavior, time, intertemporal, cognitive noise, social brain network

Citation: Persson E, Tinghög G and Västfjäll D (2024) Intertemporal prosocial behavior: a review and research agenda. Front. Psychol . 15:1359447. doi: 10.3389/fpsyg.2024.1359447

Received: 21 December 2023; Accepted: 25 March 2024; Published: 08 April 2024.

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Copyright © 2024 Persson, Tinghög and Västfjäll. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Emil Persson, [email protected]

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.

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A scoping review on physical literacy domains associated with participation in sports video games among youth and adolescence

• Published: 24 April 2024

Cite this article

• Wai Keung Ho   ORCID: orcid.org/0000-0003-0387-9869 1 ,
• Kim Wai Raymond Sum   ORCID: orcid.org/0000-0002-4051-9945 1 &
• Di Tang   ORCID: orcid.org/0000-0002-6962-6939 1  

Sports video games (SVGs) are one of the most popular genres in video gaming, which are suggested to be associated to physical literacy (PL). The objective of the current scoping review is to identify and summarize the empirical evidence on PL domains associated with participation in SVGs among youth and adolescence, based on the Australian Physical Literacy Framework (APLF). The literature search followed the PRISMA-ScR guidelines on databases PubMed, Scopus and Web of Science. This review included studies that evaluated any outcomes associated with the participation in SVGs based on APLF: physical, psychological, social, and cognitive domains. Articles related to other video game genres or gambling were excluded. All types of devices, modes of playing and intensities of play were included. Finally, there were 3859 articles retrieved from which 11 met the inclusion criteria. The most studied outcomes were related to the psychological and the cognitive domains which shown that SVGs to be effective in increasing motivation and engagement, and enhancing total knowledge in real-life sports. This finding provides a new insight that this sedentary behavior could be used in promoting sports and might help to solve the problem of physical inactivity. However, more research is needed for the physical and the social domains regarding to SVGs play among youth and adolescents. The current evidence base relating to SVGs is not large enough to be able to understand the associations of some gaming variables, such as duration of time, frequency, skill levels, mode of playing and gender, to PL and risky behaviors among youth and adolescents.

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Abbreviations

Australian Physical Literacy Framework

Active video game

Entertainment Software Association

International Physical Literacy Association

Massive multiplayer online role-playing games

• Physical literacy

Sports video game

World Health Organization

exempli gratia

Adachi, P. J., & Willoughby, T. (2015). From the couch to the sports field: The longitudinal associations between sports video game play, self-esteem, and involvement in sports. Psychology of Popular Media Culture , 4 (4), 329.

Article   Google Scholar  

Adachi, P. J., & Willoughby, T. (2016). Does playing sports video games predict increased involvement in real-life sports over several years among older adolescents and emerging adults? Journal of Youth and Adolescence , 45 , 391–401.

Article   PubMed   Google Scholar  

Ballard, M., Gray, M., Reilly, J., & Noggle, M. (2009). Correlates of video game screen time among males: Body mass, physical activity, and other media use. Eating Behaviors , 10 (3), 161–167.

Boyle, E. A., Hainey, T., Connolly, T. M., Gray, G., Earp, J., Ott, M., & Pereira, J. (2016). An update to the systematic literature review of empirical evidence of the impacts and outcomes of computer games and serious games. Computers & Education , 94 , 178–192.

Cairney, J., Dudley, D., Kwan, M., Bulten, R., & Kriellaars, D. (2019). Physical literacy, physical activity and health: Toward an evidence-informed conceptual model. Sports Medicine , 49 , 371–383.

Campelo, A. M., Weisberg, A., Sheehan, D. P., Schneider, K., Cossich, V. R., & Katz, L. (2023). Physical and affective physical literacy domains improved after a six-week exergame exercise program in older adults: A randomized controlled clinical trial. Games for Health Journal, 12 (5), 366–376.

Entertainment Software Association (2023). 2023 Essential facts about the U.S. video game industry. Retrieved from: https://www.theesa.com/wp-content/uploads/2023/07/ESA_2023_Essential_Facts_FINAL_07092023.pdf . Accessed 1 Oct 2023.

Farmer, O., Belton, S., & O’Brien, W. (2017). The relationship between actual fundamental motor skill proficiency, perceived motor skill confidence and competence, and physical activity in 8–12-year-old Irish female youth. Sports , 5 (4), 74.

Article   PubMed   PubMed Central   Google Scholar  

Ferguson, C. J., & Kilburn, J. (2010). Much ado about nothing: the misestimation and overinterpretation of violent video game effects in eastern and western nations: comment on Anderson et al. (2010). Psychological Bulletin, 136 (2), 174–178. https://doi.org/10.1037/a0018566

Friedemann, C., Heneghan, C., Mahtani, K., Thompson, M., Perera, R., & Ward, A. M. (2012). Cardiovascular disease risk in healthy children and its association with body mass index: systematic review and meta-analysis. Bmj , 345 .

García, J., & Murillo, C. (2020). Sports video games participation: What can we learn for esports? Sport Business and Management: An International Journal, 10 (2), 169–185.

Gentile, D. (2009). Pathological video-game use among youth ages 8 to 18: A national study. Psychological Science , 20 (5), 594–602.

George, A. M., Rohr, L. E., & Byrne, J. (2016). Impact of Nintendo Wii games on physical literacy in children: Motor skills, physical fitness, activity behaviors, and knowledge. Sports , 4 (1), 3.

Gilbert, M. A., Giaccardi, S., & Ward, L. M. (2018). Contributions of game genre and masculinity ideologies to associations between video game play and men’s risk-taking behavior. Media Psychology , 21 (3), 437–456.

Granic, I., Lobel, A., & Engels, R. C. (2014). The benefits of playing video games. American Psychologist , 69 (1), 66.

Green, C. S., & Seitz, A. R. (2015). The impacts of video games on cognition (and how the government can guide the industry). Policy Insights from the Behavioral and Brain Sciences , 2 (1), 101–110.

Hayes, E., & Silberman, L. (2007). Incorporating video games into physical education. Journal of Physical Education Recreation & Dance , 78 (3), 18–24.

Hoyt, L. T., Chase-Lansdale, P. L., McDade, T. W., & Adam, E. K. (2012). Positive youth, healthy adults: Does positive well-being in adolescence predict better perceived health and fewer risky health behaviors in young adulthood? Journal of Adolescent Health , 50 (1), 66–73.

International Physical Literacy Association (2017). IPLA definition. Retrieved from https://www.physical-literacy.org.uk/

Jenny, S. E., & Schary, D. (2014). Exploring the effectiveness of learning American Football through playing the video game Madden NFL. International Journal of Technology in Teaching and Learning , 10 (1), 72–87.

Google Scholar  

Jenny, S. E., Chung, J. J., Rademaker, S. M., & Schary, D. P. (2017). Learning a sport through video gaming: A mixed-methods experimental study. Loading… , 10 (17).

Jenny, S. E., Chung, J. J., & Krause, J. M. (2022). Sport video gaming verses direct instruction: Examining sport knowledge and future sport intention. International Journal of Human Movement Science , 16 (2), 1–19.

Kane, D. (2020). An investigation to determine if sport video games helps community college students become interested in real-life sports (Doctoral dissertation, United States Sports Academy). The Sports Journal, 24 .

Lanningham-Foster, L., Jensen, T. B., Foster, R. C., Redmond, A. B., Walker, B. A., Heinz, D., & Levine, J. A. (2006). Energy expenditure of sedentary screen time compared with active screen time for children. Pediatrics , 118 (6), e1831–e1835.

Leonard, D. (2009). An untapped field: Exploring the world of virtual sports gaming. Handbook of sports and media (pp. 426–441). Routledge.

Lisha, N. E., & Sussman, S. (2010). Relationship of high school and college sports participation with alcohol, tobacco, and illicit drug use: A review. Addictive Behaviors , 35 (5), 399–407.

Longmuir, P. E., Boyer, C., Lloyd, M., Yang, Y., Boiarskaia, E., Zhu, W., & Tremblay, M. S. (2015). The Canadian assessment of physical literacy: Methods for children in grades 4 to 6 (8 to 12 years). BMC Public Health , 15 , 1–11.

Lumsden, J., Edwards, E. A., Lawrence, N. S., Coyle, D., & Munafò, M. R. (2016). Gamification of cognitive assessment and cognitive training: A systematic review of applications and efficacy. JMIR Serious Games , 4(2), e5888.

Mentzoni, R. A., Brunborg, G. S., Molde, H., Myrseth, H., Skouverøe, K. J. M., Hetland, J., & Pallesen, S. (2011). Problematic video game use: Estimated prevalence and associations with mental and physical health. Cyberpsychology Behavior and Social Networking , 14 (10), 591–596.

Merino-Campos, C., del-Castillo, H., & Pascual-Gómez, I. (2023). Enhancing adolescent reasoning skills through a video game program. Education and Information Technologies , 1–20.

Newzoo (2021). Global cloud gaming report (website). https://newzoo.com/insights/trend-reports/global-cloud-gaming-report-2021-free-version . Assessed 15 June 2022.

Ng, K., Kaskinen, A. P., Katila, R., Koski, P., & Karhulahti, V. M. (2022). Associations between sports videogames and physical activity in children. Physical Culture and Sport Studies and Research , 95 (1), 68–75.

Peever, N., Johnson, D., & Gardner, J. (2012). Personality & video game genre preferences. In Proceedings of the 8th australasian conference on interactive entertainment: Playing the system (pp. 1–3).

Pelletier, V. H., Lessard, A., Piché, F., Tétreau, C., & Descarreaux, M. (2020). Video games and their associations with physical health: A scoping review. BMJ open Sport & Exercise Medicine , 6 (1), e000832.

Puolitaival, T., Sieppi, M., Pyky, R., Enwald, H., Korpelainen, R., & Nurkkala, M. (2020). Health behaviours associated with video gaming in adolescent men: A cross-sectional population-based MOPO study. BMC Public Health , 20 , 1–8.

Salmensalo, M., Ruotsalainen, H., Hylkilä, K., Kääriäinen, M., Konttila, J., Männistö, M., & Männikkö, N. (2022). Associations between digital gaming behavior and physical activity among Finnish vocational students. Journal of Public Health , 1–11.

Saunders, T. J., Prince, S. A., & Tremblay, M. S. (2011). Clustering of children’s activity behaviour: The use of self-report versus direct measures. International Journal of Behavioral Nutrition and Physical Activity , 8 (1), 1–2.

Saunders, T. J., MacDonald, D. J., Copeland, J. L., Longmuir, P. E., Barnes, J. D., Belanger, K., & Tremblay, M. S. (2018). The relationship between sedentary behaviour and physical literacy in Canadian children: A cross-sectional analysis from the RBC-CAPL learn to play study. Bmc Public Health , 18 (2), 1–21.

Silberman, L. B. (2005). Athletes’ use of video games to mediate their play: College students’ use of sport video games. In Paper delivered at the 2005 Seminar Series, Caladonian University School of Computing and Mathematical Sciences, Glasgow, Scotland .

Sport Australia (2019). The Australian Physical Literacy Framework. https://www.sportaus.gov.au/__data/assets/pdf_file/0019/710173/35455_Physical-Literacy-Framework_access.pdf  . Accessed 11 Aug 2023.

Tremblay, M. S., Aubert, S., Barnes, J. D., Saunders, T. J., Carson, V., Latimer-Cheung, A. E., & Chinapaw, M. J. (2017). Sedentary behavior research network (SBRN)–terminology consensus project process and outcome. International Journal of Behavioral Nutrition and Physical Activity , 14 , 1–17.

Tricco, A. C., Lillie, E., Zarin, W., O’Brien, K. K., Colquhoun, H., Levac, D., & Straus, S. E. (2018). PRISMA extension for scoping reviews (PRISMA-ScR): Checklist and explanation. Annals of Internal Medicine , 169 (7), 467–473.

Van der Ploeg, H. P., & Hillsdon, M. (2017). Is sedentary behaviour just physical inactivity by another name? International Journal of Behavioral Nutrition and Physical Activity , 14 , 1–8.

Warburton, D. E., & Bredin, S. S. (2017). Health benefits of physical activity: A systematic review of current systematic reviews. Current Opinion in Cardiology , 32 (5), 541–556.

World Health Organization. (2022). Global status report on physical activity 2022: Country profiles . World Health Organization.

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The authors would like to thank Professor Wong Heung Sang Stephen, and Professor Chung Peichi for giving constructive and helpful feedback throughout the study.

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Ho, W.K., Sum, K.W.R. & Tang, D. A scoping review on physical literacy domains associated with participation in sports video games among youth and adolescence. Curr Psychol (2024). https://doi.org/10.1007/s12144-024-05997-4

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Writing a Scientific Review Article: Comprehensive Insights for Beginners

Ayodeji amobonye.

1 Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, KwaZulu-Natal, Durban 4000, South Africa

2 Writing Centre, Durban University of Technology, P.O. Box 1334 KwaZulu-Natal, Durban 4000, South Africa

Japareng Lalung

3 School of Industrial Technology, Universiti Sains Malaysia, Gelugor 11800, Pulau Pinang, Malaysia

Santhosh Pillai

Associated data.

The data and materials that support the findings of this study are available from the corresponding author upon reasonable request.

Review articles present comprehensive overview of relevant literature on specific themes and synthesise the studies related to these themes, with the aim of strengthening the foundation of knowledge and facilitating theory development. The significance of review articles in science is immeasurable as both students and researchers rely on these articles as the starting point for their research. Interestingly, many postgraduate students are expected to write review articles for journal publications as a way of demonstrating their ability to contribute to new knowledge in their respective fields. However, there is no comprehensive instructional framework to guide them on how to analyse and synthesise the literature in their niches into publishable review articles. The dearth of ample guidance or explicit training results in students having to learn all by themselves, usually by trial and error, which often leads to high rejection rates from publishing houses. Therefore, this article seeks to identify these challenges from a beginner's perspective and strives to plug the identified gaps and discrepancies. Thus, the purpose of this paper is to serve as a systematic guide for emerging scientists and to summarise the most important information on how to write and structure a publishable review article.

1. Introduction

Early scientists, spanning from the Ancient Egyptian civilization to the Scientific Revolution of the 16 th /17 th century, based their research on intuitions, personal observations, and personal insights. Thus, less time was spent on background reading as there was not much literature to refer to. This is well illustrated in the case of Sir Isaac Newton's apple tree and the theory of gravity, as well as Gregor Mendel's pea plants and the theory of inheritance. However, with the astronomical expansion in scientific knowledge and the emergence of the information age in the last century, new ideas are now being built on previously published works, thus the periodic need to appraise the huge amount of already published literature [ 1 ]. According to Birkle et al. [ 2 ], the Web of Science—an authoritative database of research publications and citations—covered more than 80 million scholarly materials. Hence, a critical review of prior and relevant literature is indispensable for any research endeavour as it provides the necessary framework needed for synthesising new knowledge and for highlighting new insights and perspectives [ 3 ].

Review papers are generally considered secondary research publications that sum up already existing works on a particular research topic or question and relate them to the current status of the topic. This makes review articles distinctly different from scientific research papers. While the primary aim of the latter is to develop new arguments by reporting original research, the former is focused on summarising and synthesising previous ideas, studies, and arguments, without adding new experimental contributions. Review articles basically describe the content and quality of knowledge that are currently available, with a special focus on the significance of the previous works. To this end, a review article cannot simply reiterate a subject matter, but it must contribute to the field of knowledge by synthesising available materials and offering a scholarly critique of theory [ 4 ]. Typically, these articles critically analyse both quantitative and qualitative studies by scrutinising experimental results, the discussion of the experimental data, and in some instances, previous review articles to propose new working theories. Thus, a review article is more than a mere exhaustive compilation of all that has been published on a topic; it must be a balanced, informative, perspective, and unbiased compendium of previous studies which may also include contrasting findings, inconsistencies, and conventional and current views on the subject [ 5 ].

Hence, the essence of a review article is measured by what is achieved, what is discovered, and how information is communicated to the reader [ 6 ]. According to Steward [ 7 ], a good literature review should be analytical, critical, comprehensive, selective, relevant, synthetic, and fully referenced. On the other hand, a review article is considered to be inadequate if it is lacking in focus or outcome, overgeneralised, opinionated, unbalanced, and uncritical [ 7 ]. Most review papers fail to meet these standards and thus can be viewed as mere summaries of previous works in a particular field of study. In one of the few studies that assessed the quality of review articles, none of the 50 papers that were analysed met the predefined criteria for a good review [ 8 ]. However, beginners must also realise that there is no bad writing in the true sense; there is only writing in evolution and under refinement. Literally, every piece of writing can be improved upon, right from the first draft until the final published manuscript. Hence, a paper can only be referred to as bad and unfixable when the author is not open to corrections or when the writer gives up on it.

According to Peat et al. [ 9 ], “everything is easy when you know how,” a maxim which applies to scientific writing in general and review writing in particular. In this regard, the authors emphasized that the writer should be open to learning and should also follow established rules instead of following a blind trial-and-error approach. In contrast to the popular belief that review articles should only be written by experienced scientists and researchers, recent trends have shown that many early-career scientists, especially postgraduate students, are currently expected to write review articles during the course of their studies. However, these scholars have little or no access to formal training on how to analyse and synthesise the research literature in their respective fields [ 10 ]. Consequently, students seeking guidance on how to write or improve their literature reviews are less likely to find published works on the subject, particularly in the science fields. Although various publications have dealt with the challenges of searching for literature, or writing literature reviews for dissertation/thesis purposes, there is little or no information on how to write a comprehensive review article for publication. In addition to the paucity of published information to guide the potential author, the lack of understanding of what constitutes a review paper compounds their challenges. Thus, the purpose of this paper is to serve as a guide for writing review papers for journal publishing. This work draws on the experience of the authors to assist early-career scientists/researchers in the “hard skill” of authoring review articles. Even though there is no single path to writing scientifically, or to writing reviews in particular, this paper attempts to simplify the process by looking at this subject from a beginner's perspective. Hence, this paper highlights the differences between the types of review articles in the sciences while also explaining the needs and purpose of writing review articles. Furthermore, it presents details on how to search for the literature as well as how to structure the manuscript to produce logical and coherent outputs. It is hoped that this work will ease prospective scientific writers into the challenging but rewarding art of writing review articles.

2. Benefits of Review Articles to the Author

Analysing literature gives an overview of the “WHs”: WHat has been reported in a particular field or topic, WHo the key writers are, WHat are the prevailing theories and hypotheses, WHat questions are being asked (and answered), and WHat methods and methodologies are appropriate and useful [ 11 ]. For new or aspiring researchers in a particular field, it can be quite challenging to get a comprehensive overview of their respective fields, especially the historical trends and what has been studied previously. As such, the importance of review articles to knowledge appraisal and contribution cannot be overemphasised, which is reflected in the constant demand for such articles in the research community. However, it is also important for the author, especially the first-time author, to recognise the importance of his/her investing time and effort into writing a quality review article.

Generally, literature reviews are undertaken for many reasons, mainly for publication and for dissertation purposes. The major purpose of literature reviews is to provide direction and information for the improvement of scientific knowledge. They also form a significant component in the research process and in academic assessment [ 12 ]. There may be, however, a thin line between a dissertation literature review and a published review article, given that with some modifications, a literature review can be transformed into a legitimate and publishable scholarly document. According to Gülpınar and Güçlü [ 6 ], the basic motivation for writing a review article is to make a comprehensive synthesis of the most appropriate literature on a specific research inquiry or topic. Thus, conducting a literature review assists in demonstrating the author's knowledge about a particular field of study, which may include but not be limited to its history, theories, key variables, vocabulary, phenomena, and methodologies [ 10 ]. Furthermore, publishing reviews is beneficial as it permits the researchers to examine different questions and, as a result, enhances the depth and diversity of their scientific reasoning [ 1 ]. In addition, writing review articles allows researchers to share insights with the scientific community while identifying knowledge gaps to be addressed in future research. The review writing process can also be a useful tool in training early-career scientists in leadership, coordination, project management, and other important soft skills necessary for success in the research world [ 13 ]. Another important reason for authoring reviews is that such publications have been observed to be remarkably influential, extending the reach of an author in multiple folds of what can be achieved by primary research papers [ 1 ]. The trend in science is for authors to receive more citations from their review articles than from their original research articles. According to Miranda and Garcia-Carpintero [ 14 ], review articles are, on average, three times more frequently cited than original research articles; they also asserted that a 20% increase in review authorship could result in a 40–80% increase in citations of the author. As a result, writing reviews can significantly impact a researcher's citation output and serve as a valuable channel to reach a wider scientific audience. In addition, the references cited in a review article also provide the reader with an opportunity to dig deeper into the topic of interest. Thus, review articles can serve as a valuable repository for consultation, increasing the visibility of the authors and resulting in more citations.

3. Types of Review Articles

The first step in writing a good literature review is to decide on the particular type of review to be written; hence, it is important to distinguish and understand the various types of review articles. Although scientific review articles have been classified according to various schemes, however, they are broadly categorised into narrative reviews, systematic reviews, and meta-analyses [ 15 ]. It was observed that more authors—as well as publishers—were leaning towards systematic reviews and meta-analysis while downplaying narrative reviews; however, the three serve different aims and should all be considered equally important in science [ 1 ]. Bibliometric reviews and patent reviews, which are closely related to meta-analysis, have also gained significant attention recently. However, from another angle, a review could also be of two types. In the first class, authors could deal with a widely studied topic where there is already an accumulated body of knowledge that requires analysis and synthesis [ 3 ]. At the other end of the spectrum, the authors may have to address an emerging issue that would benefit from exposure to potential theoretical foundations; hence, their contribution would arise from the fresh theoretical foundations proposed in developing a conceptual model [ 3 ].

3.1. Narrative Reviews

Narrative reviewers are mainly focused on providing clarification and critical analysis on a particular topic or body of literature through interpretative synthesis, creativity, and expert judgement. According to Green et al. [ 16 ], a narrative review can be in the form of editorials, commentaries, and narrative overviews. However, editorials and commentaries are usually expert opinions; hence, a beginner is more likely to write a narrative overview, which is more general and is also referred to as an unsystematic narrative review. Similarly, the literature review section of most dissertations and empirical papers is typically narrative in nature. Typically, narrative reviews combine results from studies that may have different methodologies to address different questions or to formulate a broad theoretical formulation [ 1 ]. They are largely integrative as strong focus is placed on the assimilation and synthesis of various aspects in the review, which may involve comparing and contrasting research findings or deriving structured implications [ 17 ]. In addition, they are also qualitative studies because they do not follow strict selection processes; hence, choosing publications is relatively more subjective and unsystematic [ 18 ]. However, despite their popularity, there are concerns about their inherent subjectivity. In many instances, when the supporting data for narrative reviews are examined more closely, the evaluations provided by the author(s) become quite questionable [ 19 ]. Nevertheless, if the goal of the author is to formulate a new theory that connects diverse strands of research, a narrative method is most appropriate.

3.2. Systematic Reviews

In contrast to narrative reviews, which are generally descriptive, systematic reviews employ a systematic approach to summarise evidence on research questions. Hence, systematic reviews make use of precise and rigorous criteria to identify, evaluate, and subsequently synthesise all relevant literature on a particular topic [ 12 , 20 ]. As a result, systematic reviews are more likely to inspire research ideas by identifying knowledge gaps or inconsistencies, thus helping the researcher to clearly define the research hypotheses or questions [ 21 ]. Furthermore, systematic reviews may serve as independent research projects in their own right, as they follow a defined methodology to search and combine reliable results to synthesise a new database that can be used for a variety of purposes [ 22 ]. Typically, the peculiarities of the individual reviewer, different search engines, and information databases used all ensure that no two searches will yield the same systematic results even if the searches are conducted simultaneously and under identical criteria [ 11 ]. Hence, attempts are made at standardising the exercise via specific methods that would limit bias and chance effects, prevent duplications, and provide more accurate results upon which conclusions and decisions can be made.

The most established of these methods is the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines which objectively defined statements, guidelines, reporting checklists, and flowcharts for undertaking systematic reviews as well as meta-analysis [ 23 ]. Though mainly designed for research in medical sciences, the PRISMA approach has gained wide acceptance in other fields of science and is based on eight fundamental propositions. These include the explicit definition of the review question, an unambiguous outline of the study protocol, an objective and exhaustive systematic review of reputable literature, and an unambiguous identification of included literature based on defined selection criteria [ 24 ]. Other considerations include an unbiased appraisal of the quality of the selected studies (literature), organic synthesis of the evidence of the study, preparation of the manuscript based on the reporting guidelines, and periodic update of the review as new data emerge [ 24 ]. Other methods such as PRISMA-P (Preferred Reporting Items for Systematic review and Meta-Analysis Protocols), MOOSE (Meta-analysis Of Observational Studies in Epidemiology), and ROSES (Reporting Standards for Systematic Evidence Syntheses) have since been developed for systematic reviews (and meta-analysis), with most of them being derived from PRISMA.

Consequently, systematic reviews—unlike narrative reviews—must contain a methodology section which in addition to all that was highlighted above must fully describe the precise criteria used in formulating the research question and setting the inclusion or exclusion criteria used in selecting/accessing the literature. Similarly, the criteria for evaluating the quality of the literature included in the review as well as for analysing, synthesising, and disseminating the findings must be fully described in the methodology section.

3.3. Meta-Analysis

Meta-analyses are considered as more specialised forms of systematic reviews. Generally, they combine the results of many studies that use similar or closely related methods to address the same question or share a common quantitative evaluation method [ 25 ]. However, meta-analyses are also a step higher than other systematic reviews as they are focused on numerical data and involve the use of statistics in evaluating different studies and synthesising new knowledge. The major advantage of this type of review is the increased statistical power leading to more reliable results for inferring modest associations and a more comprehensive understanding of the true impact of a research study [ 26 ]. Unlike in traditional systematic reviews, research topics covered in meta-analyses must be mature enough to allow the inclusion of sufficient homogeneous empirical research in terms of subjects, interventions, and outcomes [ 27 , 28 ].

Being an advanced form of systematic review, meta-analyses must also have a distinct methodology section; hence, the standard procedures involved in the traditional systematic review (especially PRISMA) also apply in meta-analyses [ 23 ]. In addition to the common steps in formulating systematic reviews, meta-analyses are required to describe how nested and missing data are handled, the effect observed in each study, the confidence interval associated with each synthesised effect, and any potential for bias presented within the sample(s) [ 17 ]. According to Paul and Barari [ 28 ], a meta-analysis must also detail the final sample, the meta-analytic model, and the overall analysis, moderator analysis, and software employed. While the overall analysis involves the statistical characterization of the relationships between variables in the meta-analytic framework and their significance, the moderator analysis defines the different variables that may affect variations in the original studies [ 28 , 29 ]. It must also be noted that the accuracy and reliability of meta-analyses have both been significantly enhanced by the incorporation of statistical approaches such as Bayesian analysis [ 30 ], network analysis [ 31 ], and more recently, machine learning [ 32 ].

3.4. Bibliometric Review

A bibliometric review, commonly referred to as bibliometric analysis, is a systematic evaluation of published works within a specific field or discipline [ 33 ]. This bibliometric methodology involves the use of quantitative methods to analyse bibliometric data such as the characteristics and numbers of publications, units of citations, authorship, co-authorship, and journal impact factors [ 34 ]. Academics use bibliometric analysis with different objectives in mind, which includes uncovering emerging trends in article and journal performance, elaborating collaboration patterns and research constituents, evaluating the impact and influence of particular authors, publications, or research groups, and highlighting the intellectual framework of a certain field [ 35 ]. It is also used to inform policy and decision-making. Similarly to meta-analysis, bibliometric reviews rely upon quantitative techniques, thus avoiding the interpretation bias that could arise from the qualitative techniques of other types of reviews [ 36 ]. However, while bibliometric analysis synthesises the bibliometric and intellectual structure of a field by examining the social and structural linkages between various research parts, meta-analysis focuses on summarising empirical evidence by probing the direction and strength of effects and relationships among variables, especially in open research questions [ 37 , 38 ]. However, similarly to systematic review and meta-analysis, a bibliometric review also requires a well-detailed methodology section. The amount of data to be analysed in bibliometric analysis is quite massive, running to hundreds and tens of thousands in some cases. Although the data are objective in nature (e.g., number of citations and publications and occurrences of keywords and topics), the interpretation is usually carried out through both objective (e.g., performance analysis) and subjective (e.g., thematic analysis) evaluations [ 35 ]. However, the invention and availability of bibliometric software such as BibExcel, Gephi, Leximancer, and VOSviewer and scientific databases such as Dimensions, Web of Science, and Scopus have made this type of analysis more feasible.

3.5. Patent Review

Patent reviews provide a comprehensive analysis and critique of a specific patent or a group of related patents, thus presenting a concise understanding of the technology or innovation that is covered by the patent [ 39 ]. This type of article is useful for researchers as it also enhances their understanding of the legal, technical, and commercial aspects of an intellectual property/innovation; in addition, it is also important for stakeholders outside the research community including IP (intellectual property) specialists, legal professionals, and technology-transfer officers [ 40 ]. Typically, patent reviews encompass the scope, background, claims, legal implications, technical specifications, and potential commercial applications of the patent(s). The article may also include a discussion of the patent's strengths and weaknesses, as well as its potential impact on the industry or field in which it operates. Most times, reviews are time specified, they may be regionalised, and the data are usually retrieved via patent searches on databases such as that of the European Patent Office ( https://www.epo.org/searching.html ), United States Patent and Trademark Office ( https://patft.uspto.gov/ ), the World Intellectual Property Organization's PATENTSCOPE ( https://patentscope.wipo.int/search/en/structuredSearch.jsf ), Google Patent ( https://www.google.com/?tbm=pts ), and China National Intellectual Property Administration ( https://pss-system.cponline.cnipa.gov.cn/conventionalSearch ). According to Cerimi et al. [ 41 ], the retrieved data and analysed may include the patent number, patent status, filing date, application date, grant dates, inventor, assignee, and pending applications. While data analysis is usually carried out by general data software such as Microsoft Excel, an intelligence software solely dedicated to patent research and analysis, Orbit Intelligence has been found to be more efficient [ 39 ]. It is also mandatory to include a methodology section in a patent review, and this should be explicit, thorough, and precise to allow a clear understanding of how the analysis was carried out and how the conclusions were arrived at.

4. Searching Literature

One of the most challenging tasks in writing a review article on a subject is the search for relevant literature to populate the manuscript as the author is required to garner information from an endless number of sources. This is even more challenging as research outputs have been increasing astronomically, especially in the last decade, with thousands of new articles published annually in various fields. It is therefore imperative that the author must not only be aware of the overall trajectory in a field of investigation but must also be cognizant of recent studies so as not to publish outdated research or review articles. Basically, the search for the literature involves a coherent conceptual structuring of the topic itself and a thorough collation of evidence under the common themes which might reflect the histories, conflicts, standoffs, revolutions, and/or evolutions in the field [ 7 ]. To start the search process, the author must carefully identify and select broad keywords relevant to the subject; subsequently, the keywords should be developed to refine the search into specific subheadings that would facilitate the structure of the review.

Two main tactics have been identified for searching the literature, namely, systematic and snowballing [ 42 ]. The systematic approach involves searching literature with specific keywords (for example, cancer, antioxidant, and nanoparticles), which leads to an almost unmanageable and overwhelming list of possible sources [ 43 ]. The snowballing approach, however, involves the identification of a particular publication, followed by the compilation of a bibliography of articles based on the reference list of the identified publication [ 44 ]. Many times, it might be necessary to combine both approaches, but irrespective, the author must keep an accurate track and record of papers cited in the search. A simple and efficient strategy for populating the bibliography of review articles is to go through the abstract (and sometimes the conclusion) of a paper; if the abstract is related to the topic of discourse, the author might go ahead and read the entire article; otherwise, he/she is advised to move on [ 45 ]. Winchester and Salji [ 5 ] noted that to learn the background of the subject/topic to be reviewed, starting literature searches with academic textbooks or published review articles is imperative, especially for beginners. Furthermore, it would also assist in compiling the list of keywords, identifying areas of further exploration, and providing a glimpse of the current state of the research. However, past reviews ideally are not to serve as the foundation of a new review as they are written from someone else's viewpoint, which might have been tainted with some bias. Fortunately, the accessibility and search for the literature have been made relatively easier than they were a few decades ago as the current information age has placed an enormous volume of knowledge right at our fingertips [ 46 ]. Nevertheless, when gathering the literature from the Internet, authors should exercise utmost caution as much of the information may not be verified or peer-reviewed and thus may be unregulated and unreliable. For instance, Wikipedia, despite being a large repository of information with more than 6.7 million articles in the English language alone, is considered unreliable for scientific literature reviews, due to its openness to public editing [ 47 ]. However, in addition to peer-reviewed journal publications—which are most ideal—reviews can also be drawn from a wide range of other sources such as technical documents, in-house reports, conference abstracts, and conference proceedings. Similarly, “Google Scholar”—as against “Google” and other general search engines—is more appropriate as its searches are restricted to only academic articles produced by scholarly societies or/and publishers [ 48 ]. Furthermore, the various electronic databases, such as ScienceDirect, Web of Science, PubMed, and MEDLINE, many of which focus on specific fields of research, are also ideal options [ 49 ]. Advancement in computer indexing has remarkably expanded the ease and ability to search large databases for every potentially relevant article. In addition to searching by topic, literature search can be modified by time; however, there must be a balance between old papers and recent ones. The general consensus in science is that publications less than five years old are considered recent.

It is important, especially in systematic reviews and meta-analyses, that the specific method of running the computer searches be properly documented as there is the need to include this in the method (methodology) section of such papers. Typically, the method details the keywords, databases explored, search terms used, and the inclusion/exclusion criteria applied in the selection of data and any other specific decision/criteria. All of these will ensure the reproducibility and thoroughness of the search and the selection procedure. However, Randolph [ 10 ] noted that Internet searches might not give the exhaustive list of articles needed for a review article; hence, it is advised that authors search through the reference lists of articles that were obtained initially from the Internet search. After determining the relevant articles from the list, the author should read through the references of these articles and repeat the cycle until saturation is reached [ 10 ]. After populating the articles needed for the literature review, the next step is to analyse them individually and in their whole entirety. A systematic approach to this is to identify the key information within the papers, examine them in depth, and synthesise original perspectives by integrating the information and making inferences based on the findings. In this regard, it is imperative to link one source to the other in a logical manner, for instance, taking note of studies with similar methodologies, papers that agree, or results that are contradictory [ 42 ].

5. Structuring the Review Article

The title and abstract are the main selling points of a review article, as most readers will only peruse these two elements and usually go on to read the full paper if they are drawn in by either or both of the two. Tullu [ 50 ] recommends that the title of a scientific paper “should be descriptive, direct, accurate, appropriate, interesting, concise, precise, unique, and not be misleading.” In addition to providing “just enough details” to entice the reader, words in the titles are also used by electronic databases, journal websites, and search engines to index and retrieve a particular paper during a search [ 51 ]. Titles are of different types and must be chosen according to the topic under review. They are generally classified as descriptive, declarative, or interrogative and can also be grouped into compound, nominal, or full-sentence titles [ 50 ]. The subject of these categorisations has been extensively discussed in many articles; however, the reader must also be aware of the compound titles, which usually contain a main title and a subtitle. Typically, subtitles provide additional context—to the main title—and they may specify the geographic scope of the research, research methodology, or sample size [ 52 ].

Just like primary research articles, there are many debates about the optimum length of a review article's title. However, the general consensus is to keep the title as brief as possible while not being too general. A title length between 10 and 15 words is recommended, since longer titles can be more challenging to comprehend. Paiva et al. [ 53 ] observed that articles which contain 95 characters or less get more views and citations. However, emphasis must be placed on conciseness as the audience will be more satisfied if they can understand what exactly the review has contributed to the field, rather than just a hint about the general topic area. Authors should also endeavour to stick to the journal's specific requirements, especially regarding the length of the title and what they should or should not contain [ 9 ]. Thus, avoidance of filler words such as “a review on/of,” “an observation of,” or “a study of” is a very simple way to limit title length. In addition, abbreviations or acronyms should be avoided in the title, except the standard or commonly interpreted ones such as AIDS, DNA, HIV, and RNA. In summary, to write an effective title, the authors should consider the following points. What is the paper about? What was the methodology used? What were the highlights and major conclusions? Subsequently, the author should list all the keywords from these answers, construct a sentence from these keywords, and finally delete all redundant words from the sentence title. It is also possible to gain some ideas by scanning indices and article titles in major journals in the field. It is important to emphasise that a title is not chosen and set in stone, and the title is most likely to be continually revised and adjusted until the end of the writing process.

5.2. Abstract

The abstract, also referred to as the synopsis, is a summary of the full research paper; it is typically independent and can stand alone. For most readers, a publication does not exist beyond the abstract, partly because abstracts are often the only section of a paper that is made available to the readers at no cost, whereas the full paper may attract a payment or subscription [ 54 ]. Thus, the abstract is supposed to set the tone for the few readers who wish to read the rest of the paper. It has also been noted that the abstract gives the first impression of a research work to journal editors, conference scientific committees, or referees, who might outright reject the paper if the abstract is poorly written or inadequate [ 50 ]. Hence, it is imperative that the abstract succinctly represents the entire paper and projects it positively. Just like the title, abstracts have to be balanced, comprehensive, concise, functional, independent, precise, scholarly, and unbiased and not be misleading [ 55 ]. Basically, the abstract should be formulated using keywords from all the sections of the main manuscript. Thus, it is pertinent that the abstract conveys the focus, key message, rationale, and novelty of the paper without any compromise or exaggeration. Furthermore, the abstract must be consistent with the rest of the paper; as basic as this instruction might sound, it is not to be taken for granted. For example, a study by Vrijhoef and Steuten [ 56 ] revealed that 18–68% of 264 abstracts from some scientific journals contained information that was inconsistent with the main body of the publications.

Abstracts can either be structured or unstructured; in addition, they can further be classified as either descriptive or informative. Unstructured abstracts, which are used by many scientific journals, are free flowing with no predefined subheadings, while structured abstracts have specific subheadings/subsections under which the abstract needs to be composed. Structured abstracts have been noted to be more informative and are usually divided into subsections which include the study background/introduction, objectives, methodology design, results, and conclusions [ 57 ]. No matter the style chosen, the author must carefully conform to the instructions provided by the potential journal of submission, which may include but are not limited to the format, font size/style, word limit, and subheadings [ 58 ]. The word limit for abstracts in most scientific journals is typically between 150 and 300 words. It is also a general rule that abstracts do not contain any references whatsoever.

Typically, an abstract should be written in the active voice, and there is no such thing as a perfect abstract as it could always be improved on. It is advised that the author first makes an initial draft which would contain all the essential parts of the paper, which could then be polished subsequently. The draft should begin with a brief background which would lead to the research questions. It might also include a general overview of the methodology used (if applicable) and importantly, the major results/observations/highlights of the review paper. The abstract should end with one or few sentences about any implications, perspectives, or future research that may be developed from the review exercise. Finally, the authors should eliminate redundant words and edit the abstract to the correct word count permitted by the journal [ 59 ]. It is always beneficial to read previous abstracts published in the intended journal, related topics/subjects from other journals, and other reputable sources. Furthermore, the author should endeavour to get feedback on the abstract especially from peers and co-authors. As the abstract is the face of the whole paper, it is best that it is the last section to be finalised, as by this time, the author would have developed a clearer understanding of the findings and conclusions of the entire paper.

5.3. Graphical Abstracts

Since the mid-2000s, an increasing number of journals now require authors to provide a graphical abstract (GA) in addition to the traditional written abstract, to increase the accessibility of scientific publications to readers [ 60 ]. A study showed that publications with GA performed better than those without it, when the abstract views, total citations, and downloads were compared [ 61 ]. However, the GA should provide “a single, concise pictorial, and visual summary of the main findings of an article” [ 62 ]. Although they are meant to be a stand-alone summary of the whole paper, it has been noted that they are not so easily comprehensible without having read through the traditionally written abstract [ 63 ]. It is important to note that, like traditional abstracts, many reputable journals require GAs to adhere to certain specifications such as colour, dimension, quality, file size, and file format (usually JPEG/JPG, PDF, PNG, or TIFF). In addition, it is imperative to use engaging and accurate figures, all of which must be synthesised in order to accurately reflect the key message of the paper. Currently, there are various online or downloadable graphical tools that can be used for creating GAs, such as Microsoft Paint or PowerPoint, Mindthegraph, ChemDraw, CorelDraw, and BioRender.

5.4. Keywords

As a standard practice, journals require authors to select 4–8 keywords (or phrases), which are typically listed below the abstract. A good set of keywords will enable indexers and search engines to find relevant papers more easily and can be considered as a very concise abstract [ 64 ]. According to Dewan and Gupta [ 51 ], the selection of appropriate keywords will significantly enhance the retrieval, accession, and consequently, the citation of the review paper. Ideally, keywords can be variants of the terms/phrases used in the title, the abstract, and the main text, but they should ideally not be the exact words in the main title. Choosing the most appropriate keywords for a review article involves listing down the key terms and phrases in the article, including abbreviations. Subsequently, a quick review of the glossary/vocabulary/term list or indexing standard in the specific discipline will assist in selecting the best and most precise keywords that match those used in the databases from the list drawn. In addition, the keywords should not be broad or general terms (e.g., DNA, biology, and enzymes) but must be specific to the field or subfield of study as well as to the particular paper [ 65 ].

5.5. Introduction

The introduction of an article is the first major section of the manuscript, and it presents basic information to the reader without compelling them to study past publications. In addition, the introduction directs the reader to the main arguments and points developed in the main body of the article while clarifying the current state of knowledge in that particular area of research [ 12 ]. The introduction part of a review article is usually sectionalised into background information, a description of the main topic and finally a statement of the main purpose of the review [ 66 ]. Authors may begin the introduction with brief general statements—which provide background knowledge on the subject matter—that lead to more specific ones [ 67 ]. It is at this point that the reader's attention must be caught as the background knowledge must highlight the importance and justification for the subject being discussed, while also identifying the major problem to be addressed [ 68 ]. In addition, the background should be broad enough to attract even nonspecialists in the field to maximise the impact and widen the reach of the article. All of these should be done in the light of current literature; however, old references may also be used for historical purposes. A very important aspect of the introduction is clearly stating and establishing the research problem(s) and how a review of the particular topic contributes to those problem(s). Thus, the research gap which the paper intends to fill, the limitations of previous works and past reviews, if available, and the new knowledge to be contributed must all be highlighted. Inadequate information and the inability to clarify the problem will keep readers (who have the desire to obtain new information) from reading beyond the introduction [ 69 ]. It is also pertinent that the author establishes the purpose of reviewing the literature and defines the scope as well as the major synthesised point of view. Furthermore, a brief insight into the criteria used to select, evaluate, and analyse the literature, as well as the outline or sequence of the review, should be provided in the introduction. Subsequently, the specific objectives of the review article must be presented. The last part of the “introduction” section should focus on the solution, the way forward, the recommendations, and the further areas of research as deduced from the whole review process. According to DeMaria [ 70 ], clearly expressed or recommended solutions to an explicitly revealed problem are very important for the wholesomeness of the “introduction” section. It is believed that following these steps will give readers the opportunity to track the problems and the corresponding solution from their own perspective in the light of current literature. As against some suggestions that the introduction should be written only in present tenses, it is also believed that it could be done with other tenses in addition to the present tense. In this regard, general facts should be written in the present tense, specific research/work should be in the past tense, while the concluding statement should be in the past perfect or simple past. Furthermore, many of the abbreviations to be used in the rest of the manuscript and their explanations should be defined in this section.

5.6. Methodology

Writing a review article is equivalent to conducting a research study, with the information gathered by the author (reviewer) representing the data. Like all major studies, it involves conceptualisation, planning, implementation, and dissemination [ 71 ], all of which may be detailed in a methodology section, if necessary. Hence, the methodological section of a review paper (which can also be referred to as the review protocol) details how the relevant literature was selected and how it was analysed as well as summarised. The selection details may include, but are not limited to, the database consulted and the specific search terms used together with the inclusion/exclusion criteria. As earlier highlighted in Section 3 , a description of the methodology is required for all types of reviews except for narrative reviews. This is partly because unlike narrative reviews, all other review articles follow systematic approaches which must ensure significant reproducibility [ 72 ]. Therefore, where necessary, the methods of data extraction from the literature and data synthesis must also be highlighted as well. In some cases, it is important to show how data were combined by highlighting the statistical methods used, measures of effect, and tests performed, as well as demonstrating heterogeneity and publication bias [ 73 ].

The methodology should also detail the major databases consulted during the literature search, e.g., Dimensions, ScienceDirect, Web of Science, MEDLINE, and PubMed. For meta-analysis, it is imperative to highlight the software and/or package used, which could include Comprehensive Meta-Analysis, OpenMEE, Review Manager (RevMan), Stata, SAS, and R Studio. It is also necessary to state the mathematical methods used for the analysis; examples of these include the Bayesian analysis, the Mantel–Haenszel method, and the inverse variance method. The methodology should also state the number of authors that carried out the initial review stage of the study, as it has been recommended that at least two reviews should be done blindly and in parallel, especially when it comes to the acquisition and synthesis of data [ 74 ]. Finally, the quality and validity assessment of the publication used in the review must be stated and well clarified [ 73 ].

5.7. Main Body of the Review

Ideally, the main body of a publishable review should answer these questions: What is new (contribution)? Why so (logic)? So what (impact)? How well it is done (thoroughness)? The flow of the main body of a review article must be well organised to adequately maintain the attention of the readers as well as guide them through the section. It is recommended that the author should consider drawing a conceptual scheme of the main body first, using methods such as mind-mapping. This will help create a logical flow of thought and presentation, while also linking the various sections of the manuscript together. According to Moreira [ 75 ], “reports do not simply yield their findings, rather reviewers make them yield,” and thus, it is the author's responsibility to transform “resistant” texts into “docile” texts. Hence, after the search for the literature, the essential themes and key concepts of the review paper must be identified and synthesised together. This synthesis primarily involves creating hypotheses about the relationships between the concepts with the aim of increasing the understanding of the topic being reviewed. The important information from the various sources should not only be summarised, but the significance of studies must be related back to the initial question(s) posed by the review article. Furthermore, MacLure [ 76 ] stated that data are not just to be plainly “extracted intact” and “used exactly as extracted,” but must be modified, reconfigured, transformed, transposed, converted, tabulated, graphed, or manipulated to enable synthesis, combination, and comparison. Therefore, different pieces of information must be extracted from the reports in which they were previously deposited and then refined into the body of the new article [ 75 ]. To this end, adequate comparison and combination might require that “qualitative data be quantified” or/and “quantitative data may be qualitized” [ 77 ]. In order to accomplish all of these goals, the author may have to transform, paraphrase, generalize, specify, and reorder the text [ 78 ]. For comprehensiveness, the body paragraphs should be arranged in a similar order as it was initially stated in the abstract or/and introduction. Thus, the main body could be divided into thematic areas, each of which could be independently comprehensive and treated as a mini review. Similarly, the sections can also be arranged chronologically depending on the focus of the review. Furthermore, the abstractions should proceed from a wider general view of the literature being reviewed and then be narrowed down to the specifics. In the process, deep insights should also be provided between the topic of the review and the wider subject area, e.g., fungal enzymes and enzymes in general. The abstractions must also be discussed in more detail by presenting more specific information from the identified sources (with proper citations of course!). For example, it is important to identify and highlight contrary findings and rival interpretations as well as to point out areas of agreement or debate among different bodies of literature. Often, there are previous reviews on the same topic/concept; however, this does not prevent a new author from writing one on the same topic, especially if the previous reviews were written many years ago. However, it is important that the body of the new manuscript be written from a new angle that was not adequately covered in the past reviews and should also incorporate new studies that have accumulated since the last review(s). In addition, the new review might also highlight the approaches, limitations, and conclusions of the past studies. But the authors must not be excessively critical of the past reviews as this is regarded by many authors as a sign of poor professionalism [ 3 , 79 ]. Daft [ 79 ] emphasized that it is more important for a reviewer to state how their research builds on previous work instead of outright claiming that previous works are incompetent and inadequate. However, if a series of related papers on one topic have a common error or research flaw that needs rectification, the reviewer must point this out with the aim of moving the field forward [ 3 ]. Like every other scientific paper, the main body of a review article also needs to be consistent in style, for example, in the choice of passive vs. active voice and present vs. past tense. It is also important to note that tables and figures can serve as a powerful tool for highlighting key points in the body of the review, and they are now considered core elements of reviews. For more guidance and insights into what should make up the contents of a good review article, readers are also advised to get familiarised with the Boote and Beile [ 80 ] literature review scoring rubric as well as the review article checklist of Short [ 81 ].

5.8. Tables and Figures

An ideal review article should be logically structured and efficiently utilise illustrations, in the form of tables and figures, to convey the key findings and relationships in the study. According to Tay [ 13 ], illustrations often take a secondary role in review papers when compared to primary research papers which are focused on illustrations. However, illustrations are very important in review articles as they can serve as succinct means of communicating major findings and insights. Franzblau and Chung [ 82 ] pointed out that illustrations serve three major purposes in a scientific article: they simplify complex data and relationships for better understanding, they minimise reading time by summarising and bringing to focus on the key findings (or trends), and last, they help to reduce the overall word count. Hence, inserting and constructing illustrations in a review article is as meticulous as it is important. However, important decisions should be made on whether the charts, figures, or tables to be potentially inserted in the manuscript are indeed needed and how best to design them [ 83 ]. Illustrations should enhance the text while providing necessary information; thus, the information described in illustrations should not contradict that in the main text and should also not be a repetition of texts [ 84 ]. Furthermore, illustrations must be autonomous, meaning they ought to be intelligible without having to read the text portion of the manuscript; thus, the reader does not have to flip back and forth between the illustration and the main text in order to understand it [ 85 ]. It should be noted that tables or figures that directly reiterate the main text or contain extraneous information will only make a mess of the manuscript and discourage readers [ 86 ].

Kotz and Cals [ 87 ] recommend that the layout of tables and figures should be carefully designed in a clear manner with suitable layouts, which will allow them to be referred to logically and chronologically in the text. In addition, illustrations should only contain simple text, as lengthy details would contradict their initial objective, which was to provide simple examples or an overview. Furthermore, the use of abbreviations in illustrations, especially tables, should be avoided if possible. If not, the abbreviations should be defined explicitly in the footnotes or legends of the illustration [ 88 ]. Similarly, numerical values in tables and graphs should also be correctly approximated [ 84 ]. It is recommended that the number of tables and figures in the manuscript should not exceed the target journal's specification. According to Saver [ 89 ], they ideally should not account for more than one-third of the manuscript. Finally, the author(s) must seek permission and give credits for using an already published illustration when necessary. However, none of these are needed if the graphic is originally created by the author, but if it is a reproduced or an adapted illustration, the author must obtain permission from the copyright owner and include the necessary credit. One of the very important tools for designing illustrations is Creative Commons, a platform that provides a wide range of creative works which are available to the public for use and modification.

5.9. Conclusion/Future Perspectives

It has been observed that many reviews end abruptly with a short conclusion; however, a lot more can be included in this section in addition to what has been said in the major sections of the paper. Basically, the conclusion section of a review article should provide a summary of key findings from the main body of the manuscript. In this section, the author needs to revisit the critical points of the paper as well as highlight the accuracy, validity, and relevance of the inferences drawn in the article review. A good conclusion should highlight the relationship between the major points and the author's hypothesis as well as the relationship between the hypothesis and the broader discussion to demonstrate the significance of the review article in a larger context. In addition to giving a concise summary of the important findings that describe current knowledge, the conclusion must also offer a rationale for conducting future research [ 12 ]. Knowledge gaps should be identified, and themes should be logically developed in order to construct conceptual frameworks as well as present a way forward for future research in the field of study [ 11 ].

Furthermore, the author may have to justify the propositions made earlier in the manuscript, demonstrate how the paper extends past research works, and also suggest ways that the expounded theories can be empirically examined [ 3 ]. Unlike experimental studies which can only draw either a positive conclusion or ambiguous failure to reject the null hypothesis, four possible conclusions can be drawn from review articles [ 1 ]. First, the theory/hypothesis propounded may be correct after being proven from current evidence; second, the hypothesis may not be explicitly proven but is most probably the best guess. The third conclusion is that the currently available evidence does not permit a confident conclusion or a best guess, while the last conclusion is that the theory or hypothesis is false [ 1 ]. It is important not to present new information in the conclusion section which has link whatsoever with the rest of the manuscript. According to Harris et al. [ 90 ], the conclusions should, in essence, answer the question: if a reader were to remember one thing about the review, what would it be?

5.10. References

As it has been noted in different parts of this paper, authors must give the required credit to any work or source(s) of information that was included in the review article. This must include the in-text citations in the main body of the paper and the corresponding entries in the reference list. Ideally, this full bibliographical list is the last part of the review article, and it should contain all the books, book chapters, journal articles, reports, and other media, which were utilised in the manuscript. It has been noted that most journals and publishers have their own specific referencing styles which are all derived from the more popular styles such as the American Psychological Association (APA), Chicago, Harvard, Modern Language Association (MLA), and Vancouver styles. However, all these styles may be categorised into either the parenthetical or numerical referencing style. Although a few journals do not have strict referencing rules, it is the responsibility of the author to reference according to the style and instructions of the journal. Omissions and errors must be avoided at all costs, and this can be easily achieved by going over the references many times for due diligence [ 11 ]. According to Cronin et al. [ 12 ], a separate file for references can be created, and any work used in the manuscript can be added to this list immediately after being cited in the text [ 12 ]. In recent times, the emergence of various referencing management software applications such as Endnote, RefWorks, Mendeley, and Zotero has even made referencing easier. The majority of these software applications require little technical expertise, and many of them are free to use, while others may require a subscription. It is imperative, however, that even after using these software packages, the author must manually curate the references during the final draft, in order to avoid any errors, since these programs are not impervious to errors, particularly formatting errors.

6. Concluding Remarks

Writing a review article is a skill that needs to be learned; it is a rigorous but rewarding endeavour as it can provide a useful platform to project the emerging researcher or postgraduate student into the gratifying world of publishing. Thus, the reviewer must develop the ability to think critically, spot patterns in a large volume of information, and must be invested in writing without tiring. The prospective author must also be inspired and dedicated to the successful completion of the article while also ensuring that the review article is not just a mere list or summary of previous research. It is also important that the review process must be focused on the literature and not on the authors; thus, overt criticism of existing research and personal aspersions must be avoided at all costs. All ideas, sentences, words, and illustrations should be constructed in a way to avoid plagiarism; basically, this can be achieved by paraphrasing, summarising, and giving the necessary acknowledgments. Currently, there are many tools to track and detect plagiarism in manuscripts, ensuring that they fall within a reasonable similarity index (which is typically 15% or lower for most journals). Although the more popular of these tools, such as Turnitin and iThenticate, are subscription-based, there are many freely available web-based options as well. An ideal review article is supposed to motivate the research topic and describe its key concepts while delineating the boundaries of research. In this regard, experience-based information on how to methodologically develop acceptable and impactful review articles has been detailed in this paper. Furthermore, for a beginner, this guide has detailed “the why” and “the how” of authoring a good scientific review article. However, the information in this paper may as a whole or in parts be also applicable to other fields of research and to other writing endeavours such as writing literature review in theses, dissertations, and primary research articles. Finally, the intending authors must put all the basic rules of scientific writing and writing in general into cognizance. A comprehensive study of the articles cited within this paper and other related articles focused on scientific writing will further enhance the ability of the motivated beginner to deliver a good review article.

Acknowledgments

This work was supported by the National Research Foundation of South Africa under grant number UID 138097. The authors would like to thank the Durban University of Technology for funding the postdoctoral fellowship of the first author, Dr. Ayodeji Amobonye.

Data Availability

Conflicts of interest.

The authors declare that they have no conflicts of interest.

• Open access
• Published: 08 November 2023

Policies to prevent zoonotic spillover: a systematic scoping review of evaluative evidence

• Chloe Clifford Astbury 1 , 2 , 3 ,
• Kirsten M. Lee 1 , 2 ,
• Ryan Mcleod 1 ,
• Raphael Aguiar 2 ,
• Asma Atique 1 ,
• Marilen Balolong 4 ,
• Janielle Clarke 1 ,
• Anastassia Demeshko 1 ,
• Ronald Labonté 5 ,
• Arne Ruckert 5 ,
• Priyanka Sibal 6 ,
• Kathleen Chelsea Togño 4 ,
• A. M. Viens 1 , 3 ,
• Mary Wiktorowicz 1 , 2 ,
• Marc K. Yambayamba 7 ,
• Amy Yau 8 &
• Tarra L. Penney 1 , 2 , 3  

Globalization and Health volume  19 , Article number:  82 ( 2023 ) Cite this article

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Emerging infectious diseases of zoonotic origin present a critical threat to global population health. As accelerating globalisation makes epidemics and pandemics more difficult to contain, there is a need for effective preventive interventions that reduce the risk of zoonotic spillover events. Public policies can play a key role in preventing spillover events. The aim of this review is to identify and describe evaluations of public policies that target the determinants of zoonotic spillover. Our approach is informed by a One Health perspective, acknowledging the inter-connectedness of human, animal and environmental health.

In this systematic scoping review, we searched Medline, SCOPUS, Web of Science and Global Health in May 2021 using search terms combining animal health and the animal-human interface, public policy, prevention and zoonoses. We screened titles and abstracts, extracted data and reported our process in line with PRISMA-ScR guidelines. We also searched relevant organisations’ websites for evaluations published in the grey literature. All evaluations of public policies aiming to prevent zoonotic spillover events were eligible for inclusion. We summarised key data from each study, mapping policies along the spillover pathway.

Our review found 95 publications evaluating 111 policies. We identified 27 unique policy options including habitat protection; trade regulations; border control and quarantine procedures; farm and market biosecurity measures; public information campaigns; and vaccination programmes, as well as multi-component programmes. These were implemented by many sectors, highlighting the cross-sectoral nature of zoonotic spillover prevention. Reports emphasised the importance of surveillance data in both guiding prevention efforts and enabling policy evaluation, as well as the importance of industry and private sector actors in implementing many of these policies. Thoughtful engagement with stakeholders ranging from subsistence hunters and farmers to industrial animal agriculture operations is key for policy success in this area.

This review outlines the state of the evaluative evidence around policies to prevent zoonotic spillover in order to guide policy decision-making and focus research efforts. Since we found that most of the existing policy evaluations target ‘downstream’ determinants, additional research could focus on evaluating policies targeting ‘upstream’ determinants of zoonotic spillover, such as land use change, and policies impacting infection intensity and pathogen shedding in animal populations, such as those targeting animal welfare.

The increasing incidence of zoonotic emerging infectious diseases (EIDs) has been attributed to behavioural practices and ecological and socioeconomic change, and is predicted to continue in the coming years [ 1 ]. Higher levels of anthropogenic activity, including agricultural intensification, urbanisation and other forms of land use change, have led to increased interactions between wildlife, humans and livestock, increasing the risk of cross-species transmission [ 2 , 3 , 4 ]. Meanwhile, accelerating rates of globalisation and urbanisation, leading to increased global movement of people and goods and more dense human settlements, have made outbreaks of disease in human populations more difficult to contain [ 5 ]. In response, a call has been issued by leading organisations and experts, including the United Nations Environment Programme, the International Livestock Research Institute and the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services, to complement reactive policy responses with policies that prevent zoonotic EIDs [ 1 , 6 , 7 , 8 , 9 , 10 ]. This approach, sometimes called deep prevention, would need to target upstream drivers to reduce the risk of outbreaks occuring [ 11 ].

Zoonotic spillover, defined as the transmission of a pathogen from an animal to a human, depends on the alignment of ecological, epidemiological and behavioural factors [ 12 ]. Zoonotic pathogens must be transmitted across a spillover pathway (Fig.  1 ) in order to induce infections in humans [ 12 , 13 ]. This involves meeting a series of conditions including appropriate density and distribution of reservoir hosts, pathogen prevalence, infection intensity and human exposure [ 12 ]. Across this pathway, a number of drivers of zoonotic spillover have been identified, including changes in wildlife and livestock populations [ 14 ]; deforestation, urbanisation and other forms of land use change [ 15 , 16 ]; bushmeat consumption [ 17 , 18 , 19 ]; and a variety of human practices including hunting, farming, animal husbandry, mining, keeping of exotic pets and trade [ 8 , 9 , 20 , 21 , 22 ]. These large-scale changes have repeatedly given rise to spillover events [ 2 , 15 , 23 ], sometimes involving pathogens with epidemic or pandemic potential [ 24 ].

Spillover pathway adapted from Plowright et al. [ 12 , 13 ]

The responsibility for addressing zoonotic disease frequently spans multiple sectors of governance due to its relevance for both animals and humans. A One Health perspective, which recognises the health of humans, animals and the environment as being closely linked and inter-dependent [ 25 ], can be useful in understanding the spillover pathway and drivers of spillover events, as well as informing policy and governance approaches to address this cross-sectoral problem. At the international level, the World Health Organization, the Food and Agriculture Organization, the World Organisation for Animal Health and the United Nations Environment Programme have endorsed a One Health approach to policymaking to respond to zoonotic infectious diseases, emphasising collaboration between agencies [ 26 ].

Operationalising a One Health approach to policy

While One Health is a promising approach to preventing zoonotic EIDs, operationalising this concept remains a challenge. Evaluative evidence exists around the effectiveness of interventions to prevent spillover events [ 13 , 27 , 28 , 29 ], however these have often been implemented as short- to medium-term programmes or academic investigations [ 8 ]. In some cases, zoonoses have re-emerged after successful programmes have ended [ 29 ]. As a result, experts have argued for the incorporation of successful interventions into policy frameworks, providing interventions with the sustainability required for long-term disease control [ 8 , 10 ].

Operationalising a One Health approach to policy involves understanding the policy options, identifying the stakeholders involved and developing insights into how to successfully implement and evaluate these policies. Although the longevity and scope of government actions may make policy an effective vehicle for prevention of emerging diseases, implementing policy is a complex process involving numerous actors with competing views and interests [ 30 ]. This context presents challenges for policy development and implementation. Where relevant policies are designed and implemented in isolation, opportunities for co-benefits may be missed and interventions may produce unintended consequences [ 31 ]. Finally, while evaluative evidence is key to informing future policy decisions, the complex systems in which policies are often implemented make evaluation challenging [ 32 ].

Aims and scope

To provide insights around how to use policy to successfully prevent zoonotic spillover events, it is necessary to synthesise the available evaluative evidence. A One Health perspective allows this evidence synthesis to incorporate a wide range of policy instruments and actors and to identify approaches to successfully implementing and evaluating policies in this complex, multi-sectoral context.

Approaches to managing epidemic and pandemic infectious pathogens when they have entered human populations have been systematically catalogued in the medical literature [ 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. These measures include hand washing, face masks, school closures, contact tracing, vaccination and case isolation. Further upstream, systematic reviews of interventions targeting the spillover pathway have predominantly focused on programmes rather than policies, and have been restricted by various characteristics such as geographic region [ 28 ] or pathogen type [ 29 ], or focused on programmes with an explicit endorsement of a One Health approach [ 27 ]. In consequence, a comprehensive understanding of what policies to prevent zoonotic spillover have been evaluated, what actors are involved, and how to successfully implement and evaluate them, is lacking. To address these research gaps, our objective was to synthesise the existing evaluative evidence around policies that target the determinants of zoonotic spillover.

Our approach to identifying and analysing this literature was informed by a One Health perspective, acknowledging the inter-connectedness of human, animal and environmental health.

We conducted a systematic scoping review of evaluations of policies aimed at preventing zoonotic spillover events, based on a previously published protocol [ 40 ]. Results are reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews [ 41 ]. The scoping review was conducted in line with guidelines published by Arksey and O’Malley and refined by Levac and colleagues [ 42 , 43 , 44 ], which emphasise an iterative approach suited to an exploratory research question.

The One Health perspective guided the development of the review methodology. This included the search strategy and inclusion criteria, which allow for the inclusion of policies focused on human, animal or environmental health (or any combination of these areas) and with leadership from one or more of these sectors, and the research questions, which seek to outline the policies and the range of sectors involved in implementation. While our focus on the spillover pathway meant we only included policies that had been evaluated in terms of their impacts on animal and human population distributions, health and interactions, we explicitly searched for environment-focused policies (e.g., protection of wetlands and other wildlife habitats) that might have been evaluated from this perspective. We also aimed to interrogate the One Health approach to governance, by assessing to what extent cross-sectoral collaboration – a key tenet of One Health practice [ 25 ] – emerged as a reason for policy success.

Stage 1: identifying the research question

Informed by our research objective, our research questions were:

What policies aimed at preventing zoonotic spillover (i.e., policies that target the determinants of zoonotic spillover included in the spillover pathway [ 12 ]: population distribution, health and interactions) have been evaluated?

What are the types of policies?

Which policy actors (single department, multi-sectoral, whole of government) are involved?

What are the reasons for policy success and failure, and the unintended consequences of implementing these policies?

How has evaluation of these policies been approached in the literature?

What are the methods or study designs used?

What are the outcomes?

What are the opportunities and challenges for evaluation?

Stage 2: identifying relevant studies

We systematically searched four electronic databases (Medline, Scopus, Web of Science, Global Health) in May 2021. The search strategy was organized by the main concepts in our research question: the spillover pathway; public policy; prevention; and zoonotic pathogens. The search strategy was developed iteratively, informed by existing systematic reviews focused on related concepts [ 28 , 45 , 46 , 47 , 48 , 49 ] and known indicator papers meeting inclusion criteria. We also searched the websites of 18 organisations involved in the prevention of zoonotic spillover to identify relevant grey literature. The choice of organisations was informed by an actor mapping exercise in which we identified key international organisations working on the prevention of emerging zoonoses using network sampling [ 50 ]. We searched the websites of a subset of these organisations, focusing on inter-governmental organisations and organisations whose main focus was zoonotic disease. See Supplementary File 1 for details of academic database and grey literature search strategies.

Stage 3: study selection

Studies were included if they met the following criteria:

Primary empirical study with an English-language abstract from any country or region (reviews were excluded);

Study reporting empirical findings from an evaluation of any sort; and.

Study focused on a policy implemented by government that targets the determinants of zoonotic spillover.

Academic records identified through the searches were collated and double screened using the online platform Covidence [ 51 ]. Two researchers (CCA and KML) initially screened titles and abstracts. Title and abstract screening of an initial set of 100 papers was undertaken by both researchers independently. Results were compared to ensure consistency in decisions around study eligibility, and discrepancies were resolved through consensus. This process was repeated until an acceptable level of agreement (> 90%) was reached. The remaining papers were then screened by one of the two reviewers. Full-text screening was undertaken by two independent researchers and discrepancies were resolved by consensus. Studies with full-texts in any language were eligible for inclusion if they include an English-language abstract. Full-text studies published in French, Spanish or Chinese were single-screened by a member of the research team fluent in that language (CCA or AY). Studies published in other languages were translated as necessary.

Grey literature was screened by one researcher (CCA) to determine whether it met the inclusion criteria. Publications were initially screened by looking at titles, tables of contents and executive summaries. Where these indicated that the publication might be eligible, documents were read in full to determine if inclusion criteria were met.

In line with published guidelines, the approach to study selection was refined iteratively when reviewing articles for inclusion [ 42 , 43 , 44 ].

Stage 4: charting the data

Data charting was conducted using a form designed to identify the information required to answer the research question and sub-research questions (see Supplementary File 2). Data charting focused on characteristics of the study, the policy, and the evaluation. For each policy, this included identifying which determinant of zoonotic spillover situated along the spillover pathway was being targeted. For the purpose of this study, we used a model of the spillover pathway adapted from Plowright et al.’s work [ 12 , 13 ], in which we differentiated between wildlife and domesticated animals (Fig.  1 ). This differentiation is important in the policy context, as the wildlife-domesticated animal interface is an important site for intervention, as well as the human-animal interface.

The data charting form was piloted with ten records to ensure that it was consistent with the research question, and revised iteratively [ 42 , 43 , 44 ]. Data charting was conducted by one researcher (CCA, RM, JC, AD or PS) and checked by a second researcher (CCA or KML). Discrepancies were resolved by consensus.

Stage 5: collating, summarising and reporting the results

Our protocol stated that we would use the Quality Assessment Tool for Quantitative Studies developed by the Effective Public Health Practice Project [ 52 ] to assess study quality [ 40 ]. However, on reviewing the included studies we selected two tools that were more appropriate to their characteristics: (1) ROBINS-I [ 53 ] for quantitative outcome evaluations and (2) a tool developed by the authors of a previous review [ 54 ] – based on Dixon-Woods et al.’s approach to assessing study credibility and contribution [ 55 ] – for all other study types. Two researchers (CCA and KML) assessed study quality independently for an initial set of 10 studies, before comparing assessments and reaching agreement where discrepancies occurred. This process was repeated until an adequate level of agreement was reached (> 90%). The remaining studies were assessed by a single researcher (CCA or KML). Records were not excluded based on quality assessment. Instead, assessments were primarily used to help synthesize the literature on how policies were evaluated. Quality assessment was not performed on grey literature due to the wide variability in the format and comprehensiveness of included publications.

We analysed the charted data, presenting a numerical summary of the included studies in table form, allowing us to describe the range of policy interventions that have been evaluated, aspects of policy implementation and approaches to evaluation. Based on the charted data, we inductively grouped evaluated policies with similar characteristics into policy types and assigned a policy instrument to each policy type: communication/marketing, guidelines, fiscal, regulation, legislation, environmental/social planning or service provision. We mapped policy types onto the spillover pathway shown in Fig.  1 to outline the policies that have been used to target each of these determinants. Thematic analysis was conducted using the approach described by Braun and Clarke where the focus is guided by the researcher’s analytic interests [ 56 ], with five overarching themes chosen as an a priori coding framework: (1) reasons for policy success; (2) reasons for policy failure; (3) unintended consequences of policy implementation; (4) opportunities for policy evaluation; and (5) challenges for policy evaluation. We selected these themes based on our research questions and previous familiarisation with the included articles during the process of article selection, data extraction and quality assessment. Sub-themes were subsequently identified through close reading and coding of the included articles. Thematic analysis was conducted by one researcher (RM) using the qualitative data analysis software Dedoose [ 57 ] and reviewed by the lead author (CCA).

Study characteristics

After removing duplicates, our searches identified a total of 5064 academic records. After screening titles and abstracts, we considered 330 records for full-text review. We also identified 11 relevant publications through our grey literature search. Grey literature reports were published by five organisations: four organisations focused on health and disease, including an intergovernmental organisation (the World Organisation for Animal Health) and three non-governmental organisations (the One Health Commission, the Global Alliance for Rabies Control and EcoHealth Alliance); and one non-governmental organisation focused on wildlife trade (TRAFFIC). In total, we included 95 publications in this review (PRISMA diagram in Fig.  2 ) [ 58 ].

We excluded studies which assessed the unintended consequences of policies to prevent zoonotic spillover without evaluating their effectiveness. This included studies that looked exclusively at the mental health impacts of mandatory livestock culls on farm workers [ 59 ]; studies which focused on potentially relevant factors, such as the wildlife trade, but with no consideration of outcomes situated on the spillover pathway [ 60 ]; and studies which assessed the detection power of surveillance systems without assessing the impact of associated policy interventions [ 61 , 62 , 63 ].

Policy characteristics

The characteristics of the policies evaluated in the included studies are presented in Supplementary File 3 and summarised in Table  1 . Some studies evaluated more than one policy, particularly modelling studies which compared the impacts of several policy options and process evaluations focused on a range of activities undertaken by a single government. Therefore, the number of evaluated policies (n = 111) is greater than the number of included studies (n = 95).

Most policies were evaluated for their impact on human exposure (21%), pathogen prevalence in domesticated animals (18%), barriers within domesticated animals (15%), and pathogen survival and spread in domesticated animals (9%). There were also a number of multi-component policies studies across multiple stages of the spillover pathway (18%). Fewer studies focused on wildlife health and populations, and none of the included studies evaluated policies for their impact on infection intensity and pathogen release in either domesticated animals or wildlife.

Where the government department responsible for implementing a policy was identified in the paper, most policies were implemented by a single department (35%), although there were a number of multi-sectoral efforts (24%). The range of government sectors responsible for implementing policies to prevent zoonotic spillover included human health, animal health, food safety, agriculture, conservation, national parks, forestry, fisheries, environmental protection, border control and foreign affairs. Policies were predominantly intended to be implemented by private sector actors, including individuals and organisations working in trade, retail, hunting and animal agriculture. However, some policies were also implemented by public sector actors working in public health, veterinary public health and environmental conservation.

Most policies were situated in high-income (49%) and upper middle-income (28%) countries, with studies from East Asia and the Pacific (43%) and Europe and Central Asia (19%) dominating. Publications focused on policies targeting various zoonotic diseases, with the most common being avian influenza (50%), rabies (19%), brucellosis (11%) and Hendra virus (4%).

Most policies were evaluated using process (38%) or outcome (31%) evaluation. The most frequently used policy instrument was legislation (59%), particularly for managing pathogen spread in domesticated animals through measures such as mandatory vaccination, culls or disinfection protocols. Meanwhile, communication and marketing or service provision was more typically used to reduce risk in wildlife and human populations, for example by providing guidance around recommended hygiene protocol, by distributing oral vaccination in wildlife habitat or by offering vaccination to human populations.

PRISMA 2020 diagram [ 58 ]

What policies aimed at preventing zoonotic spillover have been evaluated?

Policy types targeted different determinants across the pathway to zoonotic spillover and used various approaches with different evidence of success (Table  2 ). We identified policy options including culling – both general and targeted – of wild and domesticated animals; habitat protection (limiting activities such as agriculture and animal husbandry in wildlife habitats); supplemental feeding to control wildlife movements; vaccination of both wildlife, domesticated animals and human populations with occupational exposure to animals; policies to improve biosecurity in sites where animals are kept, slaughtered and sold, including mandates and information campaigns; live animal market closures; and bans on hunting and selling wildlife. Where outcomes or impacts were evaluated, most policies saw some level of success (i.e., outcome measures were found to vary in a direction that indicated policy success), though relative effectiveness was not assessed due to variation in study design and outcome measure. Policies with consistent evidence of effectiveness – where outcome measures varied in a direction that indicated policy success in all studies included in the review – included culling and sterilisation of wildlife populations, habitat protection, vaccination in wildlife and domesticated animal populations and mandated disinfection protocols. Policies with equivocal evidence of success (i.e., outcome measures varied in different directions or studies had different findings, some indicating success and some indicating failure) included supplemental feeding of wildlife, pre-emptive livestock culls, live animal market closures and bans on wildlife hunting, trade and consumption. For many policies, there were no impact or outcome evaluations identified in this review.

What are the reasons for policy success?

The evidence from the identified impact and outcome evaluations suggests that most of the policies succeeded to some extent. A range of factors contributed to policy success. First, studies emphasized the importance of effective collaboration and coordination between various agencies, disciplines, and levels of government in the execution of policy directives [ 114 , 115 ], in line with a One Health approach to policy and governance. Policy success was attributed, in part, to strong working relationships that encouraged effective communication between various government agencies, and facilitated timely and appropriate policy responses [ 115 ]. Synergy between agencies responsible for surveillance and the execution of control strategies was also reported to be beneficial. For example, prompt communication and effective collaboration between laboratories testing samples and agencies implementing culls in the field was seen as important in the control of highly pathogenic avian influenza in Nigeria [ 116 ]. Similarly, authors also identified the importance of private-public relations and private sector contributions to implementing policies to prevent zoonotic spillover [ 112 ]. This included stronger government engagement with private veterinarians as a factor for success in reducing the spillover of Hendra virus in Queensland [ 109 ], and with farmers, poultry companies and national farming and poultry processing associations in Ghana as part of a successful campaign to reduce risk from highly pathogenic avian influenza [ 112 ]. Studies suggest that the inclusion of private sector stakeholders in the policy process has the potential to improve compliance through transparent dialogue around disease ecology, risk and risk mitigation [ 90 , 91 , 103 , 117 ]; and highlight the utility of participatory approaches in prompting behaviour changes [ 91 ].

Second, authors emphasised the significance of economic incentives, suggesting that policy impact is dependent on private actors’ appraisal of costs and benefits. Studies illustrated how incentives, including compensation, subsidies, rebates, and fines, have had varying degrees of success [ 91 , 97 , 112 , 115 ]. Compensation levels [ 104 , 114 ] and enforcement practices [ 92 ] were identified as salient factors for compliance and adherence. For example, fear of sanctions for bushmeat hunting while a ban was in place in some parts of West Africa were identified as a stronger incentive to avoid bushmeat hunting than the fear of contracting Ebola virus [ 97 ]. Culls were seen as particularly challenging in this regard: while the long-term benefits for farmers may outweigh the financial loss [ 104 ], authorities need to be conscientious of the substantial economic impacts when considering policies that mandate culling or safe disposal [ 95 ]. The direct losses related to compliance (time, labour and expenses) and indirect losses due to price fluctuations and decreases in trade volume, as well as losses to associated industries, are substantial [ 88 , 96 , 113 , 118 ].

Third, trust in government and public support for implemented policy were specified as critical factors influencing the effectiveness of disease control strategies, and research suggests that strategic engagement to facilitate compliance is a necessary step in the policy process [ 97 ]. Participatory approaches that attempt to identify and understand factors influencing compliance have been consistently used to overcome resistance to policy, as insights from engagement and consultation can lead to solutions that facilitate behaviour change at the population level [ 91 , 103 ]. For example, a World Health Organization initiative to reduce avian influenza transmission in poultry markets in Indonesia worked alongside market vendors to achieve its aims, carrying out repeated consultations with the vendors and implementing market infrastructure (such as energy and running water in the market) in collaboration with local authorities to support vendor behaviour change [ 91 ].

Fourth, studies also demonstrated the importance of public communication. The quality of information, as well as the volume, complexity and delivery of public health messages, were key factors [ 75 , 114 ]. Authors contend that communication strategies must understand the target audience and how they interpret and engage with messages [ 97 ], for example by building on relationships where there is exiting trust, such as between veterinarians advising animal vaccination and animal owners [ 117 ]. Homogenously delivered communication strategies were ineffectual: they limited opportunities for open discourse; discounted contradictory lived experiences and expressions of uncertainty; and ultimately contributed to scepticism surrounding implemented policies [ 97 , 117 ].

Finally, studies underscored the importance of surveillance infrastructure to inform intervention strategies. Surveillance programs with the ability to collect and operationalize relevant data were essential to the development of appropriate interventions that are responsive to each unique context [ 115 , 119 ]. Implementing effective surveillance programmes requires the appropriate evaluation tools [ 120 ] and trained personnel [ 81 ].

What are the reasons for policy failure?

Studies showed that perceptions of acceptability and appropriateness were crucial to the effectiveness of implemented policies [ 101 , 104 ]. Several factors were identified that negatively affected acceptability and appropriateness, including: additional expenses for private sector actors without sufficient support [ 75 , 100 , 104 , 112 , 114 ], particularly were culls were demanded but reimbursement for farmers was slow and inadequate, as in a brucellosis eradication campaign in Macedonia [ 81 ]; lack of affordable alternatives [ 97 ]; impracticality of implemented strategies [ 75 , 101 ]; lack of cultural understanding in designing policy interventions [ 97 , 100 ], for example the distribution of footwear to pig farmers in a Polynesian context where footwear was not traditionally worn [ 100 ]; lack of understanding of viral ecology [ 100 ]; as well as public scepticism and distrust [ 97 , 114 ].

Additionally, policy ineffectiveness was associated with poor planning and execution of intervention strategies, including lack of clear direction [ 114 ]; incomplete or inconsistent implementation of control measures (17); limited scope of intervention [ 114 ]; and poor enforcement [ 92 ]. A lack of adequate resources to implement strategies also contributed to policy failure [ 81 ]. Adequate financial resources were necessary to hire and train staff to run surveillance and control operations [ 81 ]. Financial resources were also necessary to fund compensation mechanisms that facilitate compliance. Willingness to adopt policy-prescribed disposal practices was found to be associated with compensation levels (incentives) as a proportion of production price, dependency on income from activities driving zoonotic risk, and contact with prevention staff [ 92 ].

What are the unintended consequences of implementing policies to prevent zoonotic spillover?

A small number of the included studies collected data on the unintended consequences of policies to prevent zoonotic spillover (n = 18). In some instances, unintended consequences were due to disease ecology or human behaviour as a result of policy failure. For example, a study assessing the impacts of the closure of a live poultry market found that, following the closure, vendors travelled to neighbouring markets to sell their animals [ 94 ]. As a result, while cases of avian influenza decreased in the area surrounding the closed market, cases increased in these neighbouring markets, leading to the wider geographic spread of the disease. In another study, elk were provided with supplementary feeding grounds to discourage them from coming into contact with the livestock who shared their range [ 65 ]. While this intervention had the intended consequence of reducing the transmission of brucellosis between elk and livestock, the spread of brucellosis between the elk using the supplementary feeding grounds – who were gathering in larger, tighter groups for longer periods, resulting in higher within-herd transmission – and other elk populations in the area increased. This resulted in an increasing prevalence of brucellosis among the elk, potentially increasing the risk of spillover to livestock. These examples illustrate the complexity of the social and ecological systems in which these policies are implemented, further suggesting the need for a One Health approach to policies to prevent zoonotic spillover.

A key unintended consequence can be attributed to the loss of profits and livelihoods sometimes associated with policies to prevent zoonotic spillover, as described above. The losses incurred by complying with regulations made farmers, hunters and other private sector actors reluctant to report potential infections, contributing to increased unauthorized or illegal activity, and unrestrained spread of disease [ 90 , 92 , 94 , 98 , 112 , 114 ]. Studies investigated the creative ways policy enforcement was circumvented, including hiding hunting equipment on the outskirts of towns or developing informal trade markets and networks [ 97 , 98 ]. Unintended consequences identified in the included evaluations emphasize an opportunity for policymakers to improve sector compliance through public education, levying the influence of consumer attitudes on industry standards [ 104 , 113 ].

A range of study designs were used to evaluate policies. Outcome evaluations (n = 33) used time series or repeat cross-sectional data to conduct evaluations of natural experiments, though most studies did not include a control group for comparison. Outcome evaluations also used case-control and modelling approaches to assess policy impact on an outcome of interest. Process evaluations (n = 30) used cross-sectional and qualitative approaches, as well as study designs combining multiple sources of data, to understand aspects of policy implementation such as the extent to which the policy was being implemented as designed, and the responses and attitudes of stakeholders involved in policy implementation. Economic evaluations (n = 11) included cost-benefit analyses, risk-benefit analyses and modelling studies. Formative evaluations (n = 17) used modelling approaches to estimate what the impacts of a proposed policy option would be in a specific context.

Outcome variables interpreted as indicators of policy success were also numerous and represented determinants along the spillover pathway. As expected, many studies assessed impact on disease transmission, including disease prevalence and incidence, disease eradication, case numbers, and basic reproduction number in human and animal populations, as well as evidence of disease in environmental samples, such as in live animal markets or at carcass disposal sites. Studies also assessed impacts on intermediate factors indicative of successful implementation of specific policies, such as the availability of wild species in markets where a trade ban had been implemented, or knowledge and practices of stakeholders in response to an educational or information campaign.

While most studies found a reduced risk of zoonotic spillover following policy implementation, comparing the magnitude of these impacts was challenging due to the variety of study designs and outcome measures used in the included studies. However, we identified several studies which used modelling to directly compare the impacts of policy options. These studies evaluated various policy scenarios: different combinations within multi-component policy interventions [ 121 ]; culling versus vaccinating wildlife [ 122 ] and livestock [ 84 , 85 ] populations; targeting strategies to humans exclusively versus targeting humans and livestock [ 108 ]; and altering the parameters for culling and vaccination strategies, for example by modelling different ranges for culling and vaccination near infected farms [ 85 ]. These studies often highlighted trade-offs between the effectiveness of policy measures and their cost. For example, estimates of the number of infected flocks were lower when incorporating a ring cull (cull of animals on farms surrounding an outbreak) into a multi-component control strategy for highly pathogenic avian influenza [ 121 ]. However, livestock vaccination was estimated to be a highly effective strategy, with one study findings livestock vaccination to be as or more effective than a pre-emptive cull for outbreak control purposes (depending on the extent of vaccination coverage), while minimising the number of animals culled [ 85 ]. One study jointly modelled costs and benefits of strategies, and found that livestock vaccination had a higher cost-benefit ratio than a wildlife cull [ 122 ]. A final study highlighted the potential of holistic approaches, with drug administration in humans and livestock having a lower cost per disability-adjusted life year averted than intervention in humans alone [ 108 ].

Study authors noted a number of challenges encountered while evaluating policies to prevent zoonotic spillover. One study noted the difficulty of determining the impact of policies aiming to reduce spillover events between wildlife, livestock and humans, as the number of spillover events is often relatively small [ 65 ]. This highlights the importance of considering upstream determinants and risk factors as outcome measures in attempting to evaluate these policies, particularly where spillover events may happen infrequently or not at all during the period of observation. Studying changes in risk factors for spillover can provide insight on the effectiveness of different policies in tackling spillover risk.

Lack of suitable data was a frequently cited barrier to policy evaluation. As policies to prevent zoonotic spillover are often reactive, being implemented in response to an outbreak in animal populations, accessing data from before a policy was implemented was challenging. Studies highlighted the value of routinely collected data, which was often the only data available and was frequently used for policy evaluation [ 65 , 66 , 94 , 115 , 119 , 123 ]. However, in many contexts routine data on animal health is not collected [ 80 ]. Routine testing data from livestock can sometimes be used for evaluation where it exists, but it does not always provide sufficient detail for examining the potential for a policy to prevent zoonotic spillover. For example, some tests do not differentiate between current and past infection, making it difficult to identify where and when spillover occurred [ 65 ], and animal health data may not be granular enough for policy evaluation, particularly in terms of evaluating local policies [ 94 ]. Studies also highlighted instances where the private sector may own data sets reporting disease prevalence and transmission, but may be reluctant to share the data for evaluation purposes [ 121 ]. In such instances, open communication and good relationships with the private sector may be facilitators to evaluation.

Beyond the lack of baseline data, studies highlighted the difficulty in collecting information about policy compliance. As failing to comply often puts farmers and hunters at risk of fines or imprisonment, they were reluctant to disclose information about non-compliance or participation in illegal trade and sale of animals [ 86 , 92 , 97 , 112 ]. This made it difficult to determine policy effectiveness.

Quality assessment

Of the 44 quantitative evaluations, 37 were evaluated as being at moderate or higher risk of bias (see Supplementary File 4), given the possibility of bias in the assessment of intervention impact due to the presence of confounding effects. A small number of studies were determined to be at serious (n = 6) or critical (n = 1) risk of bias, for two main reasons: only having data from after the intervention was implemented; or using a case-control study model without measuring and adjusting for important potential confounders, such as the prevalence of a targeted disease prior to policy implementation. These limitations may reflect the nature of zoonotic spillover events and policy responses, which can happen quickly and leave little time for baseline data collection. Many of the included studies relied on surveillance data, but where such data sets are not available, post-test and case-control study designs may be the only options.

The quality of studies assessed with the tool developed based on Dixon-Woods’ approach [ 55 ] was high overall (n = 41, see Supplementary file 5). Most studies were rated as high in terms of clearly and comprehensively presenting their results (n = 37), analysis (n = 34), research design (n = 33), aims (n = 32) and research process (n = 28). Most studies also had a high relevance to the research question (n = 31), indicating that the research was embedded in policy, being commissioned, co-designed or conducted in partnership with government stakeholders.

We identified a range of policies targeting different parts of the spillover pathway implemented by various policy and governance sectors, including some multi-sectoral initiatives. Policies tended to rely heavily on private sector actors (including actors ranging from small-scale farmers and hunters to larger commercial operations) for implementation, suggesting that open communication and collaboration with these actors was essential for successful policy implementation. Policy success was undermined by lack of collaboration between government agencies; lack of communication between surveillance and control operations; poor understanding of the context in which policies were implemented; and inadequate financial compensation for private sector actors who lost profits and incurred additional costs by complying with policies. Where policies were ineffective, this tended to be due to unintended consequences relating to complex dynamics within the social and ecological systems where policies were implemented. Lack of appropriate data was a key obstacle to policy evaluation, and studies emphasised the importance of robust surveillance infrastructure in evaluating policies that tended to be implemented reactively, in response to an outbreak of zoonotic disease in animal or human populations.

Implications for policy and practice

The key role that the private sector and industry actors play in implementing policies to prevent zoonotic spillover is an important consideration for policymakers. Our findings suggest that many of these policies must be complied with by farmers – from subsistence and smallholder farmers to large corporations – as well as by other actors, such as hunters. Lack of awareness as well as financial costs of compliance among these groups present key barriers to policy success in this area. This set of stakeholders is complex as some may make very marginal profits, if any, and may struggle to afford the additional costs of implementing preventive policies. However, powerful actors and profitable industries are also involved, including large-scale farms and primary resource extraction enterprises [ 22 ]. Acknowledging the differences across these stakeholder groups, and in particular assessing their capacity to bear some of the costs related to prevention, emerges as crucial in successful policy implementation.

Finally, our findings highlight the importance of disease surveillance in efforts to reduce the risk of spillover events. As well as acting as an early warning system, surveillance provides a source of data to evaluate the impact of preventive policies. We found the availability of surveillance data to be a key enabling factor in evaluating policies. In addition, close collaboration between agencies responsible for disease surveillance and control efforts was key to policy success. National surveillance efforts, as well as cross-country collaboration to support global efforts, such as the United States Agency for International Development’s PREDICT program supporting surveillance in areas at high risk for zoonotic disease outbreaks [ 124 ], must be sustained and expanded. In complex areas such as the prevention of zoonotic spillover, approaches to surveillance which encompass risk factors and transmission pathways [ 125 ], as well as One Health surveillance systems which harmonise and integrate data collection and analysis from across human, animal and environmental sectors [ 126 ], are promising approaches to developing surveillance systems that support risk. This context also involves a need to strengthen surveillance capacity in remote and rural locations, as communities living in these contexts may have exposure to numerous pathogens of wildlife origin. This will require strengthening clinical and diagnostic capacity in these settings, as well as engaging with stakeholders such as community human and animal health workers and wildlife or national park rangers [ 127 ].

Comparison with existing literature

This review sought to map the range of policies implemented to reduce the risk of zoonotic spillover, and the various approaches taken to evaluation, and identify factors behind the success and failure of policy implementation and evaluation. Due to this broad scope, comparing relative effectiveness of policy interventions was challenging. Existing systematic reviews with a more specific focus could apply meta-analysis to determine which interventions were most effective. For example, a review of market-level biosecurity measures aiming to reduce the transmission of avian influenza found that reducing market size, separating poultry species, cleaning and disinfecting premises, closing markets and banning overnight storage were highly effective interventions [ 45 ]. However, our findings suggest that studies focused on the control of avian influenza dominate the literature in this space (55 out of 111 evaluated policies), and many of these are focused on market-level measures. Systematic reviews focused on other approaches to reduce spillover risk, such as on-farm biosecurity [ 47 ]; biosecurity for backyard poultry rearing [ 46 ]; and community-based interventions [ 28 ] comment on the paucity of high-quality evidence around the impacts of such approaches. By taking a broad perspective, we hope our findings will provide policy options for consideration in a number of contexts, and guide researchers in focusing their efforts on areas where evidence is lacking.

Strengths and weaknesses of the study

To our knowledge, this is the first attempt to systematically identify and document evaluations of policies aiming to prevent the spillover of zoonotic pathogens into human populations. However, because of the complex drivers of spillover events, some potentially relevant policy evaluations may be excluded where their outcome measures are too far removed from zoonotic spillover. While relevant, such evaluations will be difficult to systematically identify as they make no reference to zoonotic disease.

In addition, this review focused on policy evaluations that have been reported in the peer-reviewed literature and the grey literature published by international agencies and organisations working on these topics. Policies that have been implemented but not evaluated, or evaluated but not published in these literatures, will therefore be excluded from this review. As a result, potentially effective and important policies in the prevention of zoonotic spillover events may not have been identified. However, we hope that the findings from this review will highlight these gaps in the evaluative evidence. We also hope that this review, by extracting practical dimensions, such as study design, outcome measures and the challenges encountered in the evaluation process, will support policymakers and researchers in carrying out further policy evaluations in this space.

Unanswered questions and future research

Our findings highlight several important gaps in the evidence. First, while observational evidence emphasises the importance of upstream determinants such as environmental and ecosystem health in the increasing rate of zoonotic spillover [ 1 , 15 ], we only identified a single evaluation of a policy attempting to target one of these upstream determinants: an evaluation carried out in China to assess the impact of the Ramstar wetland protection program on avian influenza in migratory waterfowl [ 66 ]. This study found that proximity to protected wetlands reduced outbreak risk. Authors hypothesised that this effect was due to the separation of wild waterfowl and poultry populations and the diversion of wild waterfowl away from human-dominated landscapes and toward protected natural habitats. Our findings support existing calls for more quantitative and mechanistic studies of the impact of interventions supporting environmental and ecosystem health on zoonotic spillover risk [ 128 ], as well as calls for greater integration of the environment into One Health research, policy and practice [ 31 ]. Further evaluations of environment and habitat protection policies would strengthen our understanding of this area. In addition, the impact of policies to reduce deforestation or expand forest coverage, such as China’s Grain-to-Green program [ 129 ], on the spillover pathway could be evaluated. Such evaluations might consider potential unintended consequences, as these policies could promote healthier wildlife populations with better disease resistance, but may also facilitate wildlife population growth and higher rates of wildlife-human encounters [ 130 ].

There is also a lack of evaluation of policies targeting infection intensity and pathogen release in either wildlife or domesticated animals. These could include approaches such as improving animal health and welfare to make these populations more resistant to disease [ 13 ]. While arguments have been made for strengthening legal structures supporting animal welfare in order to reduce the risk of zoonotic pathogen transmission [ 131 ], there is a need to evaluate policies that take this approach.

Our review found publications evaluating a wide range of policy interventions spanning the spillover pathway, including habitat protection; trade regulations; border control and quarantine procedures; farm and market biosecurity measures; public information campaigns; and vaccination programmes for wildlife and domesticated animals, as well as human populations with occupational exposure to animals. A wide range of governance sectors implemented these policies, highlighting the prevention of zoonotic spillover as a cross-sectoral issue, though most policies were implemented by a single sector. Our findings highlight the importance of industry and private actors in implementing policies to prevent zoonotic spillover, and the need for thoughtful and effective engagement with this wide range of actors, from subsistence hunters and farmers through to industrial animal agriculture operations to address their concerns through a range of incentives. We also identified the centrality of surveillance data in evaluating policies that are often implemented reactively, and effective collaboration between surveillance and control operations as a central factor in successful policy implementation.

Data Availability

All data generated or analysed during this study are included in this published article and its supplementary information files. Analysis code for descriptive characteristics of included policies is available on GitHub.

Abbreviations

Emerging infectious disease

Morse SS, Mazet JA, Woolhouse M, Parrish CR, Carroll D, Karesh WB, Zambrana-Torrelio C, Lipkin WI, Daszak P. Prediction and prevention of the next pandemic zoonosis. The Lancet. 2012;380:1956–65.

Article   Google Scholar  

Pulliam JRC, Epstein JH, Dushoff J, Rahman SA, Bunning M, Jamaluddin AA, Hyatt AD, Field HE, Dobson AP, Daszak P. Agricultural intensification, priming for persistence and the emergence of Nipah virus: a lethal bat-borne zoonosis. J Royal Soc Interface. 2012;9:89–101.

IPCC. In: Pörtner H-O, Roberts DC, Tignor M, Poloczanska ES, Mintenbeck K, Alegría A, Craig M, Langsdorf S, Löschke S, Möller V, Okem A, Rama B, editors. Climate Change 2022: impacts, adaptation and vulnerability, contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. In press ed. Cambridge University Press; 2022.

Brenner N, Ghosh S. Between the colossal and the catastrophic: planetary urbanization and the political ecologies of emergent Infectious Disease. Environ Plan A. 2022;54:867–910.

Gallo-Cajiao E, Lieberman S, Dolšak N, et al. Global governance for pandemic prevention and the wildlife trade. Lancet Planet Health. 2023;7:e336–45.

Article   PubMed   PubMed Central   Google Scholar  

Marco MD, Baker ML, Daszak P, et al. Opinion: sustainable development must account for pandemic risk. PNAS. 2020;117:3888–92.

Heymann DL, Dixon M. Infections at the Animal/Human interface: shifting the paradigm from emergency response to Prevention at source. In: Mackenzie JS, Jeggo M, Daszak P, Richt JA, editors. One health: the human-animal-environment interfaces in Emerging Infectious Diseases: Food Safety and Security, and International and National plans for implementation of one health activities. Berlin, Heidelberg: Springer; 2013. pp. 207–15.

Google Scholar  

United Nations Environment Programme, International Livestock Research Institute. (2020) Preventing the next pandemic: Zoonotic diseases and how to break the chain of transmission. 82.

Intergovernmental Science-Policy Platform On Biodiversity And Ecosystem Services (IPBES). (2020) Workshop Report on Biodiversity and Pandemics of the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES). https://doi.org/10.5281/ZENODO.4147317 .

One Health theory of change. https://www.who.int/publications/m/item/one-health-theory-of-change . Accessed 30 Jan 2023.

Vinuales J, Moon S, Moli GL, Burci G-L. A global pandemic treaty should aim for deep prevention. The Lancet. 2021;397:1791–2.

Article   CAS   Google Scholar  

Plowright RK, Parrish CR, McCallum H, Hudson PJ, Ko AI, Graham AL, Lloyd-Smith JO. Pathways to zoonotic spillover. Nat Rev Microbiol. 2017;15:502–10.

Article   CAS   PubMed   PubMed Central   Google Scholar  

Sokolow SH, Nova N, Pepin KM, et al. Ecological interventions to prevent and manage zoonotic pathogen spillover. Philosophical Trans Royal Soc B: Biol Sci. 2019;374:20180342.

Johnson CK, Hitchens PL, Pandit PS, Rushmore J, Evans TS, Young CCW, Doyle MM. Global shifts in mammalian population trends reveal key predictors of virus spillover risk. Proc Royal Soc B: Biol Sci. 2020;287:20192736.

Allen T, Murray KA, Zambrana-Torrelio C, Morse SS, Rondinini C, Di Marco M, Breit N, Olival KJ, Daszak P. Global hotspots and correlates of emerging zoonotic Diseases. Nat Commun. 2017;8:1124.

Gandy M. THE ZOONOTIC CITY: Urban Political Ecology and the pandemic imaginary. Int J Urban Reg Res. 2022;46:202–19.

Article   PubMed   Google Scholar  

Hardi R, Babocsay G, Tappe D, Sulyok M, Bodó I, Rózsa L. Armillifer-infected snakes sold at Congolese Bushmeat Markets Represent an emerging zoonotic threat. EcoHealth. 2017;14:743–9.

Steve A-M, Ahidjo A, Placide M-K, et al. High prevalences and a wide genetic diversity of Simian Retroviruses in non-human Primate Bushmeat in Rural areas of the Democratic Republic of Congo. EcoHealth. 2017;14:100–14.

Weiss S, Nowak K, Fahr J, Wibbelt G, Mombouli J-V, Parra H-J, Wolfe ND, Schneider BS, Leendertz FH. Henipavirus-related sequences in Fruit Bat Bushmeat, Republic of Congo. Emerg Infect Dis. 2012;18:1536–7.

Aguirre AA, Catherina R, Frye H, Shelley L. Illicit Wildlife Trade, Wet Markets, and COVID-19: preventing future pandemics. World Med Health Policy. 2020;12:256–65.

Nadimpalli ML, Pickering AJ. A call for global monitoring of WASH in wet markets. Lancet Planet Health. 2020;4:e439–40.

Viliani F, Edelstein M, Buckley E, Llamas A, Dar O. Mining and emerging infectious Diseases: results of the Infectious Disease Risk Assessment and Management (IDRAM) initiative pilot. The Extractive Industries and Society. 2017;4:251–9.

Wegner GI, Murray KA, Springmann M, Muller A, Sokolow SH, Saylors K, Morens DM. Averting wildlife-borne Infectious Disease epidemics requires a focus on socio-ecological drivers and a redesign of the global food system. eClinicalMedicine. 2022. https://doi.org/10.1016/j.eclinm.2022.101386 .

Daszak P. Anatomy of a pandemic. The Lancet. 2012;380:1883–4.

Joint Tripartite (FAO, OIE, WHO) and UNEP Statement. Tripartite and UNEP support OHHLEP’s definition of one health. ” OIE - World Organisation for Animal Health; 2021.

(2022) One Health Joint Plan of Action, 2022–2026. https://doi.org/10.4060/cc2289en .

Baum SE, Machalaba C, Daszak P, Salerno RH, Karesh WB. Evaluating one health: are we demonstrating effectiveness? One Health. 2017;3:5–10.

Halton K, Sarna M, Barnett A, Leonardo L, Graves N. A systematic review of community-based interventions for emerging zoonotic infectious Diseases in Southeast Asia. JBI Database System Rev Implement Rep. 2013;11:1–235.

Article   PubMed Central   Google Scholar  

Meyer A, Holt HR, Selby R, Guitian J. Past and Ongoing Tsetse and Animal Trypanosomiasis Control Operations in five African countries: a systematic review. PLoS Negl Trop Dis. 2016;10:e0005247.

Howlett M, Cashore B. Conceptualizing Public Policy. In: Engeli I, Allison CR, editors. Comparative Policy studies: conceptual and methodological challenges. London: Palgrave Macmillan UK; 2014. pp. 17–33.

Chapter   Google Scholar  

Barrett MA, Bouley TA. Need for enhanced environmental representation in the implementation of one health. EcoHealth. 2015;12:212–9.

Barbrook-Johnson P, Proctor A, Giorgi S, Phillipson J. How do policy evaluators understand complexity? Evaluation. 2020;26:315–32.

Saunders-Hastings P, Crispo JAG, Sikora L, Krewski D. Effectiveness of personal protective measures in reducing pandemic Influenza transmission: a systematic review and meta-analysis. Epidemics. 2017;20:1–20.

Bin Nafisah S, Alamery AH, Al Nafesa A, Aleid B, Brazanji NA. School closure during novel Influenza: a systematic review. J Infect Public Health. 2018;11:657–61.

Viner RM, Russell SJ, Croker H, Packer J, Ward J, Stansfield C, Mytton O, Bonell C, Booy R. School closure and management practices during coronavirus outbreaks including COVID-19: a rapid systematic review. The Lancet Child & Adolescent Health. 2020;4:397–404.

Juneau C-E, Pueyo T, Bell M, Gee G, Collazzo P, Potvin L. (2020) Evidence-Based, cost-effective interventions to suppress the COVID-19 pandemic: a systematic review. medRxiv 2020.04.20.20054726.

MacIntyre CR, Chughtai AA. Facemasks for the prevention of Infection in healthcare and community settings. BMJ. 2015;350:h694.

Smith SMS, Sonego S, Wallen GR, Waterer G, Cheng AC, Thompson P. Use of non-pharmaceutical interventions to reduce the transmission of Influenza in adults: a systematic review. Respirology. 2015;20:896–903.

Jefferson T, Del Mar CB, Dooley L et al. (2011) Physical interventions to interrupt or reduce the spread of respiratory viruses. Cochrane Database Syst Rev CD006207.

Astbury CC, Lee KM, Aguiar R, et al. Policies to prevent zoonotic spillover: protocol for a systematic scoping review of evaluative evidence. BMJ Open. 2022;12:e058437.

Tricco AC, Lillie E, Zarin W, et al. PRISMA Extension for scoping reviews (PRISMA-ScR): Checklist and Explanation. Ann Intern Med. 2018;169:467–73.

Arksey H, O’Malley L. Scoping studies: towards a methodological framework. Int J Soc Res Methodol. 2005;8:19–32.

Levac D, Colquhoun H, O’Brien KK. Scoping studies: advancing the methodology. Implement Sci. 2010;5:69.

Colquhoun HL, Levac D, O’Brien KK, Straus S, Tricco AC, Perrier L, Kastner M, Moher D. Scoping reviews: time for clarity in definition, methods, and reporting. J Clin Epidemiol. 2014;67:1291–4.

Zhou X, Wang Y, Liu H, Guo F, Doi SA, Smith C, Clements ACA, Edwards J, Huang B, Soares Magalhães RJ. Effectiveness of Market-Level Biosecurity at reducing exposure of Poultry and humans to Avian Influenza: a systematic review and Meta-analysis. J Infect Dis. 2018;218:1861–75.

Conan A, Goutard FL, Sorn S, Vong S. Biosecurity measures for backyard poultry in developing countries: a systematic review. BMC Vet Res. 2012;8:240.

Youssef DM, Wieland B, Knight GM, Lines J, Naylor NR. The effectiveness of biosecurity interventions in reducing the transmission of bacteria from livestock to humans at the farm level: a systematic literature review. Zoonoses Public Health. 2021;68:549–62.

Shi N, Huang J, Zhang X, Bao C, Yue N, Wang Q, Cui T, Zheng M, Huo X, Jin H. Interventions in live poultry markets for the Control of Avian Influenza: a systematic review and Meta-analysis. J Infect Dis. 2020;221:553–60.

Cupertino MC, Resende MB, Mayer NA, Carvalho LM, Siqueira-Batista R. Emerging and re-emerging human infectious Diseases: a systematic review of the role of wild animals with a focus on public health impact. Asian Pac J Trop Med. 2020;13:99.

Clifford Astbury C, Demeshko A, McLeod R, Wiktorowicz M, Gallo Caijao E, Cullerton K, Lee KM, Viens AM, Penney TL. (2023) Governance of the wildlife trade and prevention of emerging zoonoses: a mixed methods network analysis of global organisations. [In preparation].

Covidence - Better. systematic review management. https://www.covidence.org/home . Accessed 17 Jul 2020.

Effective Public Health Practice Project. (2009) Quality Assessment Tool for Quantitative Studies. 4.

Sterne JA, Hernán MA, Reeves BC, et al. ROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions. BMJ. 2016;355:i4919.

Clifford Astbury C, McGill E, Egan M, Penney TL. Systems thinking and complexity science methods and the policy process in non-communicable Disease prevention: a systematic scoping review protocol. BMJ Open. 2021;11:e049878.

Dixon-Woods M, Cavers D, Agarwal S, et al. Conducting a critical interpretive synthesis of the literature on access to healthcare by vulnerable groups. BMC Med Res Methodol. 2006;6:35.

Braun V, Clarke V. Using thematic analysis in psychology. Qualitative Res Psychol. 2006;3:77–101.

(2021) Dedoose Version 8.3.47, web application for managing, analyzing, and presenting qualitative and mixed method research data.

Page MJ, McKenzie JE, Bossuyt PM, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ. 2021;372:n71.

Park H, Chun MS, Joo Y. Traumatic stress of frontline workers in culling livestock animals in South Korea. Animals. 2020;10:1–11.

Programme UNE. Effectiveness of policy interventions relating to the illegal and unsustainable. Wildlife Trade - Policy Brief; 2019.

Cito F, Narcisi V, Danzetta ML, Iannetti S, Sabatino DD, Bruno R, Carvelli A, Atzeni M, Sauro F, Calistri P. Analysis of Surveillance systems in Place in European Mediterranean Countries for West Nile Virus (WNV) and Rift Valley Fever (RVF). Transbound Emerg Dis. 2013;60:40–4.

Schwind JS, Goldstein T, Thomas K, Mazet JA, Smith WA, PREDICT Consortium. Capacity building efforts and perceptions for wildlife surveillance to detect zoonotic pathogens: comparing stakeholder perspectives. BMC Public Health. 2014;14:684.

Reisen WK, Kramer VL, Barker CM. CALIFORNIA STATE MOSQUITO-BORNE VIRUS SURVEILLANCE AND RESPONSE PLAN: A RETROSPECTIVE EVALUATION USING CONDITIONAL SIMULATIONS *. Am J Trop Med Hyg. 2003;68:508–18.

Smith GC, Cheeseman CL. A mathematical model for the control of Diseases in wildlife populations: culling, vaccination and fertility control. Ecol Model. 2002;150:45–53.

Brennan A, Cross PC, Portacci K, Scurlock BM, Edwards WH. Shifting brucellosis risk in livestock coincides with spreading seroprevalence in elk. PLoS ONE. 2017;12:e0178780.

Wu T, Perrings C, Shang C, Collins JP, Daszak P, Kinzig A, Minteer BA. Protection of wetlands as a strategy for reducing the spread of avian Influenza from migratory waterfowl. Ambio. 2020;49:939–49.

Basinski AJ, Nuismer SL, Remien CH. A little goes a long way: weak vaccine transmission facilitates oral vaccination campaigns against zoonotic pathogens. PLoS Negl Trop Dis. 2019;13:e0007251.

Selhorst T. (1999) An evaluation of the efficiency of rabies control strategies in fox (Vulpes 6ulpes) populations using a computer simulation program. Ecol Model 12.

Shwiff SA, Sterner RT, Hale R, Jay MT, Sun B, Slate D. Benefit cost scenarios of potential oral rabies vaccination for Skunks in California. J Wildl Dis. 2009;45:227–33.

García-Díaz P, Ross JV, Woolnough AP, Cassey P. Managing the risk of wildlife Disease introduction: pathway‐level biosecurity for preventing the introduction of alien ranaviruses. J Appl Ecol. 2017;54:234–41.

Hassim A, Dekker EH, Byaruhanga C, Reardon T, van Heerden H. A retrospective study of anthrax on the Ghaap Plateau, Northern Cape province of South Africa, with special reference to the 2007–2008 outbreaks. Onderstepoort J Vet Res. 2017;84:a1414.

Knight-Jones TJD, Gibbens J, Wooldridge M, Staerk KDC. Assessment of Farm-Level Biosecurity Measures after an outbreak of Avian Influenza in the United Kingdom. Transbound Emerg Dis. 2011;58:69–75.

Article   CAS   PubMed   Google Scholar  

Karabozhilova I, Wieland B, Alonso S, Salonen L, Häsler B. Backyard chicken keeping in the Greater London Urban Area: welfare status, biosecurity and Disease control issues. Br Poult Sci. 2012;53:421–30.

Manyweathers J, Field H, Jordan D, Longnecker N, Agho K, Smith C, Taylor M. Risk mitigation of emerging zoonoses: Hendra Virus and Non-vaccinating Horse Owners. Transbound Emerg Dis. 2017;64:1898–911.

Kung N, McLaughlin A, Taylor M, Moloney B, Wright T, Field H. Hendra virus and horse owners - risk perception and management. PLoS ONE. 2013. https://doi.org/10.1371/journal.pone.0080897 .

Rasouli J, Holakoui K, Forouzanfar MH, Salari S, Bahoner, Rashidian A. Cost effectiveness of livestock vaccination for brucellosis in West-Azerbayjan province. Urmia Med J. 2009;20:Pe13–En77.

El Masry I, Rijks J, Peyre M, Taylor N, Lubroth J, Jobre Y. Modelling Influenza A H5N1 vaccination strategy scenarios in the household poultry sector in Egypt. Trop Anim Health Prod. 2014;46:57–63.

Mroz C, Gwida M, El-Ashker M, Ziegler U, Homeier-Bachmann T, Eiden M, Groschup MH. Rift valley Fever virus Infections in Egyptian cattle and their prevention. Transbound Emerg Dis. 2017;64:2049–58.

Pinsent A, Pepin KM, Zhu H, Guan Y, White MT, Riley S. (2017) The persistence of multiple strains of avian influenza in live bird markets. Proceedings of the Royal Society B: Biological Sciences 284:20170715.

Abbas B, Yousif MA, Nur HM. Animal health constraints to livestock exports from the Horn of Africa: -EN- -FR- restrictions sanitaires imposées aux exportations de bétail à partir de la corne de l’Afrique -ES- limitaciones zoosanitarias a las exportaciones de ganado desde El Cuerno De África. Rev Sci Tech OIE. 2014;33:711–21.

Naletoski I, Kirandziski T, Mitrov D, Krstevski K, Dzadzovski I, Acevski S. Gaps in brucellosis eradication campaign in Sheep and goats in Republic of Macedonia: lessons learned. Croat Med J. 2010;51:351–6.

Weaver JT, Malladi S, Bonney PJ, Patyk KA, Bergeron JG, Middleton JL, Alexander CY, Goldsmith TJ, Halvorson DA. A Simulation-based evaluation of Premovement active surveillance Protocol options for the Managed Movement of Turkeys to Slaughter during an outbreak of highly pathogenic avian Influenza in the United States. Avian Dis. 2016;60:132–45.

Andronico A, Courcoul A, Bronner A, Scoizec A, Lebouquin-Leneveu S, Guinat C, Paul MC, Durand B, Cauchemez S. Highly pathogenic avian Influenza H5N8 in south-west France 2016–2017: a modeling study of control strategies. Epidemics. 2019;28:100340.

Backer JA, van Roermund HJW, Fischer EAJ, van Asseldonk MAPM, Bergevoet RHM. Controlling highly pathogenic avian Influenza outbreaks: an epidemiological and economic model analysis. Prev Vet Med. 2015;121:142–50.

Backer JA, Hagenaars TJ, van Roermund HJW, de Jong MCM. Modelling the effectiveness and risks of vaccination strategies to control classical swine Fever epidemics. J R Soc Interface. 2009;6:849–61.

Fournie G, Guitian FJ, Mangtani P, Ghani AC. Impact of the implementation of rest days in live bird markets on the dynamics of H5N1 highly pathogenic avian Influenza. J R Soc Interface. 2011;8:1079–89.

Kung NY, Guan Y, Perkins NR, Bissett L, Ellis T, Sims L, Morris RS, Shortridge KF, Peiris JSM. The impact of a monthly Rest Day on Avian Influenza Virus isolation rates in Retail Live Poultry markets in Hong Kong. Avian Dis. 2003;47:1037–41.

Horigan V, Gale P, Adkin A, Brown I, Clark J, Kelly L. A qualitative risk assessment of cleansing and disinfection requirements after an avian Influenza outbreak in commercial poultry. Br Poult Sci. 2019;60:691–9.

Yuan J, Lau EHY, Li K, et al. Effect of live Poultry Market Closure on Avian Influenza A(H7N9) virus activity in Guangzhou, China, 2014. Emerg Infect Dis. 2015;21:1784–93.

Fournie G, Guitian J, Desvaux S, Cuong VC, Dung DH, Pfeiffer DU, Mangtani P, Ghani AC. Interventions for avian Influenza A (H5N1) risk management in live bird market networks. Proc Natl Acad Sci USA. 2013;110:9177–82.

Samaan G, Hendrawati F, Taylor T, Pitona T, Marmansari D, Rahman R, Lokuge K, Kelly PM. Application of a healthy food markets guide to two Indonesian markets to reduce transmission of avian Flu. Bull World Health Organ. 2012;90:295–300.

Huang Z, Wang J, Zuo A. Chinese farmers’ willingness to accept compensation to practice safe disposal of HPAI infected chicken. Prev Vet Med. 2017;139:67–75.

Graiver DA, Topliff CL, Kelling CL, Bartelt-Hunt SL. Survival of the avian Influenza virus (H6N2) after land disposal. Environ Sci Technol. 2009;43:4063–7.

Li Y, Wang Y, Shen C, Huang J, Kang J, Huang B, Guo F, Edwards J. Closure of live bird markets leads to the spread of H7N9 Influenza in China. PLoS ONE. 2018. https://doi.org/10.1371/journal.pone.0208884 .

Ma J, Yang N, Gu H, Bai L, Sun J, Gu S, Gu J. Effect of closure of live poultry markets in China on prevention and control of human Infection with H7N9 avian Influenza: a case study of four cities in Jiangsu Province. J Public Health Policy. 2019;40:436–47.

Chen Y, Cheng J, Xu Z, Hu W, Lu J. Live poultry market closure and avian Influenza A (H7N9) Infection in cities of China, 2013–2017: an ecological study. BMC Infect Dis. 2020. https://doi.org/10.1186/s12879-020-05091-7 .

Bonwitt J, Dawson M, Kandeh M, Ansumana R, Sahr F, Brown H, Kelly AH. Unintended consequences of the `bushmeat ban’ in West Africa during the 2013–2016 Ebola virus Disease epidemic. Soc Sci Med. 2018;200:166–73.

Brooks-Moizer F, Roberton SI, Edmunds K, Bell D. Avian Influenza H5N1 and the wild Bird Trade in Hanoi, Vietnam. Ecol Soc. 2009;14:28.

Cardador L, Tella JL, Anadon JD, Abellan P, Carrete M. The European trade ban on wild birds reduced invasion risks. Conserv Lett. 2019;12:e12631.

Guerrier G, Foster H, Metge O, Chouvin C, Tui M. Cultural contexts of swine-related Infections in Polynesia. Clin Microbiol Infect. 2013;19:595–9.

Massey PD, Polkinghorne BG, Durrheim DN, Lower T, Speare R. Blood, guts and knife cuts: reducing the risk of swine brucellosis in feral pig hunters in north-west New South Wales, Australia. Rural Remote Health. 2011;11:1793.

CAS   PubMed   Google Scholar  

Lauterbach SE, Nelson SW, Martin AM, Spurck MM, Mathys DA, Mollenkopf DF, Nolting JM, Wittum TE, Bowman AS. (2020) Adoption of recommended hand hygiene practices to limit zoonotic Disease transmission at agricultural fairs. Preventive Veterinary Medicine. https://doi.org/10.1016/j.prevetmed.2020.105116 .

Stewart RJ, Rossow J, Conover JT, et al. Do animal exhibitors support and follow recommendations to prevent transmission of variant Influenza at agricultural fairs? A survey of animal exhibitor households after a variant Influenza virus outbreak in Michigan. Zoonoses Public Health. 2018;65:195–201.

Lin X, Zhang D, Wang X, Huang Y, Du Z, Zou Y, Lu J, Hao Y. Attitudes of consumers and live-poultry workers to central slaughtering in controlling H7N9: a cross-sectional study. BMC Public Health. 2017;17:517.

Huot C, De Serres G, Duval B, Maranda-Aubut R, Ouakki M, Skowronski DM. The cost of preventing rabies at any cost: post-exposure prophylaxis for occult bat contact. Vaccine. 2008;26:4446–50.

De Serres G, Skowronski DM, Mimault P, Ouakki M, Maranda-Aubut R, Duval B. Bats in the bedroom, bats in the Belfry: reanalysis of the rationale for rabies postexposure Prophylaxis. Clin Infect Dis. 2009;48:1493–9.

Vivancos R, Showell D, Keeble B, Goh S, Kroese M, Lipp A, Battersby J. Vaccination of Poultry workers: delivery and uptake of Seasonal Influenza immunization. Zoonoses Public Health. 2011;58:126–30.

Okello AL, Thomas LF. Human taeniasis: current insights into prevention and management strategies in endemic countries. RISK MANAG HEALTHC POLICY. 2017;10:107–16.

Mendez D, Buttner P, Speare R. Hendra virus in Queensland, Australia, during the winter of 2011: veterinarians on the path to better management strategies. Prev Vet Med. 2014;117:40–51.

Häsler B, Howe KS, Hauser R, Stärk KDC. A qualitative approach to measure the effectiveness of active avian Influenza virus surveillance with respect to its cost: a case study from Switzerland. Prev Vet Med. 2012;105:209–22.

Brinkley C, Kingsley JS, Mench J. A Method for Guarding Animal Welfare and Public Health: tracking the rise of Backyard Poultry ordinances. J Community Health. 2018;43:639–46.

Turkson PK, Okike I. Assessment of practices, capacities and incentives of poultry chain actors in implementation of highly pathogenic avian Influenza mitigation measures in Ghana. Vet Med Sci. 2016;2:23–35.

Akunzule AN, Koney EBM, Tiongco M. Economic impact assessment of highly pathogenic avian Influenza on the poultry industry in Ghana. Worlds Poult Sci J. 2009;65:517–27.

Hunter C, Birden HH, Toribio J-A, Booy R, Abdurrahman M, Ambarawati AIGAA, Adiputra N. (2014) Community preparedness for highly pathogenic avian Influenza on Bali and Lombok, Indonesia. Rural Remote Health 14.

Tustin J, Laberge K, Michel P, et al. A National Epidemic of Campylobacteriosis in Iceland, lessons learned. Zoonoses Public Health. 2011;58:440–7.

Oladokun AT, Meseko CA, Ighodalo E, John B. Ekong PS Effect of intervention on the control of highly pathogenic avian Influenza in Nigeria. 8.

Manyweathers J, Field H, Longnecker N, Agho K, Smith C, Taylor M. Why won’t they just vaccinate? Horse owner risk perception and uptake of the Hendra virus vaccine. BMC Vet Res. 2017;13:103.

Zhu G, Kang M, Wei X, Tang T, Liu T, Xiao J, Song T, Ma W. Different intervention strategies toward live poultry markets against avian Influenza A (H7N9) virus: model-based assessment. Environ Res. 2020. https://doi.org/10.1016/j.envres.2020.110465 .

Chowell G, Simonsen L, Towers S, Miller MA, Viboud C. Transmission potential of Influenza A/H7N9, February to May 2013, China. BMC Med. 2013;11:214.

Bodenham RF, Mtui-Malamsha N, Gatei W, et al. Multisectoral cost analysis of a human and livestock anthrax outbreak in Songwe Region, Tanzania (December 2018–January 2019), using a novel Outbreak Costing Tool. One Health. 2021;13:100259.

Lewis N, Dorjee S, Dube C, VanLeeuwen J, Sanchez J. Assessment of Effectiveness of Control Strategies against Simulated Outbreaks of Highly Pathogenic Avian Influenza in Ontario, Canada. Transbound Emerg Dis. 2017;64:938–50.

Anderson A, Shwiff S, Gebhardt K, Ramírez AJ, Shwiff S, Kohler D, Lecuona L. Economic evaluation of Vampire Bat ( Desmodus rotundus) rabies Prevention in Mexico. Transbound Emerg Dis. 2014;61:140–6.

Walker PGT, Cauchemez S, Metras R, Dung DH, Pfeiffer D, Ghani AC. A bayesian Approach to quantifying the effects of Mass Poultry Vaccination upon the spatial and temporal dynamics of H5N1 in Northern Vietnam. PLoS Comput Biol. 2010;6:e1000683.

PREDICT Project. In: PREDICT Project. https://p2.predict.global. Accessed 9 Sep 2022.

Loh EH, Zambrana-Torrelio C, Olival KJ, Bogich TL, Johnson CK, Mazet JAK, Karesh W, Daszak P. Targeting transmission pathways for emerging zoonotic Disease Surveillance and Control. Vector-Borne and Zoonotic Diseases. 2015;15:432–7.

Bordier M, Uea-Anuwong T, Binot A, Hendrikx P, Goutard FL. Characteristics of one health surveillance systems: a systematic literature review. Prev Vet Med. 2020;181:104560.

Worsley-Tonks KEL, Bender JB, Deem SL, et al. Strengthening global health security by improving Disease surveillance in remote rural areas of low-income and middle-income countries. The Lancet Global Health. 2022;10:e579–84.

Reaser JK, Witt A, Tabor GM, Hudson PJ, Plowright RK. Ecological countermeasures for preventing zoonotic Disease outbreaks: when ecological restoration is a human health imperative. Restor Ecol. 2021;29:e13357.

Chen HL, Lewison RL, An L, Tsai YH, Stow D, Shi L, Yang S. Assessing the effects of payments for ecosystem services programs on forest structure and species biodiversity. Biodivers Conserv. 2020;29:2123–40.

Chen Y, Marino J, Tao Q, Sullivan CD, Shi K, Macdonald DW. Predicting hotspots of human-elephant conflict to inform mitigation strategies in Xishuangbanna, Southwest China. PLoS ONE. 2016. https://doi.org/10.1371/journal.pone.0162035 .

Whitfort A. COVID-19 and Wildlife Farming in China: legislating to Protect Wild Animal Health and Welfare in the wake of a global pandemic. J Environ Law. 2021;33:57–84.

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CCA, JC and TLP acknowledge internal research support from York University. MW and CCA acknowledge internal research support from the Dahdaleh Institute for Global Health Research. KML acknowledges funding from the Canadian Institutes of Health Research through a Health System Impact Fellowship. AY is funded by the BBSRC through the Mandala project (grant number BB/V004832/1). AMV acknowledges support from York University through a York Research Chair in Population Health Ethics & Law. This review was undertaken as part of a project funded by the Canadian Institutes of Health Research, Grant Reference Number VR5-172686. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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Conception and design: CCA, KLM and TLP. Acquisition of data: CCA, KLM and AY. Analysis and interpretation of data: CCA, KML, RM, JC, AD and PS. Drafting of the manuscript: CCA and RM. Critical revision of the manuscript for important intellectual content: KML, RA, AA, MB, JC, AD, RL, AR, PS, KCT, AMV, MW, MKY, AY and TLP. Obtaining funding: TLP and MW.

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Clifford Astbury, C., Lee, K.M., Mcleod, R. et al. Policies to prevent zoonotic spillover: a systematic scoping review of evaluative evidence. Global Health 19 , 82 (2023). https://doi.org/10.1186/s12992-023-00986-x

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• Zoonotic spillover
• Public policy
• Emerging zoonoses
• Deep prevention

Globalization and Health

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• Published: 17 February 2023

Malaria amongst children under five in sub-Saharan Africa: a scoping review of prevalence, risk factors and preventive interventions

• Jacob Owusu Sarfo 1 ,
• Mustapha Amoadu 1 ,
• Peace Yaa Kordorwu 1 ,
• Abdul Karim Adams 1 ,
• Thomas Boateng Gyan 1 ,
• Abdul-Ganiyu Osman 1 ,
• Immanuel Asiedu 1 &
• Edward Wilson Ansah 1  

European Journal of Medical Research volume  28 , Article number:  80 ( 2023 ) Cite this article

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Introduction

Africa has a higher burden of malaria-related cases and deaths globally. Children under five accounted for over two-thirds of all malaria deaths in sub-Saharan Africa (SSA). This scoping review aims to map evidence of the prevalence, contextual factors and health education interventions of malaria amongst children under 5 years (UN5) in SSA.

Four main databases (PubMed, Central, Dimensions and JSTOR) produced 27,841 records of literature. Additional searches in Google, Google Scholar and institutional repositories produced 37 records. Finally, 255 full-text records were further screened, and 100 records were used for this review.

Low or no formal education, poverty or low income and rural areas are risk factors for malaria amongst UN5. Evidence on age and malnutrition as risk factors for malaria in UN5 is inconsistent and inconclusive. Furthermore, the poor housing system in SSA and the unavailability of electricity in rural areas and unclean water make UN5 more susceptible to malaria. Health education and promotion interventions have significantly reduced the malaria burden on UN5 in SSA.

Well-planned and resourced health education and promotion interventions that focus on prevention, testing and treatment of malaria could reduce malaria burden amongst UN5 in SSA.

Malaria has been a serious global public health concern in the past decades, especially in Africa and other highly endemic regions [ 1 , 2 ]. The World Health Organisation (WHO) recorded about 241 million cases and 627,000 deaths globally in 2020 [ 1 ]. Africa has a higher burden of malaria-related cases accounting for 95 percent of global malaria cases in 2019. In the same year, the African region recorded 96 percent of global malaria mortality. Despite the efforts directed towards protecting people against malaria infection, the region accounted for 93 percent of all malaria deaths globally in 2020 [ 2 ]. Besides, children under five (UN5) accounted for over two-thirds of all malaria deaths in sub-Saharan Africa (SSA) [ 1 ].

In the last two decades, many policies and interventions have been implemented to control malaria at the global level. These policies and interventions have accounted for a 47 percent reduction in mortality rates amongst UN5 between 2000 and 2019 [ 3 ]. Despite this remarkable achievement, a child UN5 dies of malaria every two minutes. This means that much more must be done to protect vulnerable children, especially UN5 [ 3 ].

In SSA, the burden of malaria amongst UN5 years varies across various countries. For example, Malaria contributes to more than 30% of UN5 deaths in Nigeria, and more than 10% in Tanzania [ 2 ]. Perhaps, during this period UN5 are most vulnerable as they have lost maternal immunity and they have not yet developed specific immunity to infection. Besides, children UN5 are at highest risk for malaria infection and its related complication. Also, despite malaria is traditionally more prevalent in rural areas amongst UN5 [ 4 ], evidence shows the opposite in SSA, where malaria is more common in urban areas [ 5 , 6 , 7 ]. According to a recently published scoping review, risk factors associated with malaria infection amongst UN5 in SSA are the use of bed net and education status. However, only 13 studies were included in the review and these studies analysed secondary national surveys with limited contextual factors [ 2 ].

Furthermore, regarding possible interventions to reduce number of infections, a promising strategy is based on implementing community-based prevention and control through heath education in SSA [ 3 ]. UNICEF believes that health education and promotion policies resulted in increased insecticide-treated nets (ITNs) use among children under five in SSA, from 30 percent in 2014 to 54 percent in 2020. However, variations exist in the uptake of malaria interventions in SSA. For instance, from 2014 to 2020, less than 25 percent of children in Angola and Zimbabwe slept under ITNs. In contrast, over 80 percent of Guinea−Bissau and Niger utilised ITNs [ 3 ]. Perhaps, disparities in health education and promotion interventions have accounted for the variations in the uptake of ITNs amongst children in SSA [ 8 ]. Hence, it is pertinent to understand the role of health education and promotion interventions in preventing malaria amongst UN5 in SSA.

Therefore, this scoping review aims to map the evidence of malaria prevalence and contextual factors amongst UN5 in SSA. In addition, this review aims to map evidence on health education and promotion targeting malaria amongst UN5. This review will help inform future studies, health education and promotion interventions targeting malaria in UN5 in SSA for improved health outcomes amongst this vulnerable population.

This scoping review was conducted according to the guidelines outlined by Arksey and O’Malley [ 9 ]. The steps recommended by Arksey and O’Malley include: identifying and stating the research questions, identifying relevant studies, study selection, data collection, summary and synthesis of results and consultation. The research questions for this scoping review included: (1) what is the prevalence of malaria amongst children UN5 in SSA? (2) What are the risk factors associated with malaria infection amongst children UN5 in SSA? and (3) What are the health education and promotion interventions reported by studies to prevent malaria amongst UN5 in SSA?

Four main databases (PubMed, Central, Dimensions and JSTOR) were searched for literature. Medical Subject Heading (MeSH) terms were utilised for the search in PubMed and refined for search in other databases. The search strategy is presented in Table 1 , with exclusion and inclusion criteria. The keywords in Table 1 were moved to the MeSH. A planned search strategy in PubMed is presented in Table 2 .

These MeSH terms were adapted to fit other databases (Central Dimensions and JSTOR). The authors scrutinised the records obtained, and the Mendeley software was used to remove duplicates. The WHO Library, HINARI, Maternal Surveillance and Response Action Network, Google Scholar, Google and institutional repositories of universities in SSA were searched for additional records. Furthermore, reference lists of eligible records were checked for relevant articles.

The last search was done on July 20, 2022. The authors saved articles that met the eligibility criteria in Mendeley software for data charting. The data were independently extracted by P.Y.K. and A.K.A. and reviewed by M.A. and J.O.S. Details that were removed during the data charting process include authors and year, country where the study was conducted, study design, population, sample size, prevalence, risk factors, intervention, diagnostic strategy and funding information. In addition, all authors resolved misunderstandings and discrepancies during the data extraction process during a weekly meeting. The authors consulted a chartered librarian, Dr. Kwame Kodua-Ntim, at the Sam Jonah Library during the search and screening process. In addition, the authors consulted a review and subject experts to ensure the accuracy and depth of data for this scoping review. Finally, all authors reviewed and familiarised themselves with the extracted data and thematic analysis was done, and the results were presented.

The search conducted in the four main databases produced 27,841 records. An additional 37 records were identified through a search conducted in Google, Google Scholar and institutional repositories. After removing duplicates (5274) using the Mendeley software, 22,604 records were available for screening. In addition, 24 papers were retrieved through consultation and reference checking. Furthermore, 22,373 records were excluded because these records did not meet the inclusion criteria. In all, 231 full-text were eligible for further screening. Finally, 100 full-text records were included in the thematic analysis and synthesis (see Fig.  1 for details on the screening process in the PRISMA flow diagram).

PRISMA flow diagram of search results and record the screening process

Characteristics of reviewed studies

The majority (76) of the reviewed studies used cross-sectional surveys. Furthermore, 40 percent of the included studies were conducted in only three SSA countries; Nigeria (20), Ghana (12), and Ethiopia (8). Again, most of the included studies were published online between 2013 and 2022. See details of the characteristics of the reviewed studies in Figs.  2 , 3 and 4 .

Design of reviewed studies in sub-Saharan Africa

Countries where reviewed studies were conducted in SSA

The year reviewed studies were published online

Twenty-eight (28) of the included studies were funded [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Regarding diagnostic tools, 21/100 (21%) of the reviewed studies used microscopy [ 23 , 35 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ], 16/100 (16%) RDT [ 11 , 21 , 24 , 33 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 ] and 2/100 (2%) PCR [ 15 , 27 ]. In addition, 22 of the included studies used both RDT and microscopy [ 16 , 20 , 22 , 28 , 36 , 37 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 ] and one study used both PCR and microscopy [ 84 ] to test for malaria parasites.

Prevalence of malaria in children under five years in SSA

The reviewed studies reported malaria prevalence between 0.7 percent [ 20 ] and 80.3% [ 49 ]. Few studies reported a prevalence between 0 and 10 percent [ 18 , 20 , 36 , 38 , 43 , 63 , 67 , 72 , 73 , 74 , 77 , 85 , 86 ]. Fifty-nine studies reported a prevalence between 11 and 50 percent. Four studies [ 47 , 64 , 73 , 87 ] reported a prevalence between 51 and 60 percent, whilst 2 studies reported the highest prevalence of 79.8% [ 82 ] and 80.3% [ 49 ]. Also, RDT produced a higher prevalence in all studies that used both RDT and microscopy tests for plasmodium parasites analysis [ 18 , 73 , 81 , 82 , 83 ]. This trend is similar to the prevalence reported by a study that used both PCR and microscopy tests [ 84 ] (see Additional file 1 ).

Risk factors of malaria amongst UN5 in SSA

Socio-economic variables.

Only one of the reviewed studies reported that in Uganda boys UN5 are at higher risk of malaria infection than girls [ 70 ]. In addition, most studies that reported age as a risk factor reported that UN5 who are > 2 years [ 11 , 48 , 59 , 70 , 73 , 83 , 84 , 88 , 89 ] are at higher risk of malaria infection. It is established in the reviewed studies that low household income and poverty [ 11 , 19 , 25 , 29 , 31 , 39 , 40 , 56 , 57 , 58 , 68 , 70 , 77 , 87 , 90 , 91 , 92 , 93 ] and low maternal education [ 11 , 17 , 23 , 26 , 34 , 38 , 39 , 40 , 42 , 44 , 46 , 48 , 56 , 60 , 68 , 71 , 72 , 79 , 83 , 86 , 88 , 89 , 91 , 92 , 93 , 94 , 95 , 96 , 97 ] are risk factors of malaria for UN5 in SSA. In addition, UN5 who reside in rural areas in SSA are more susceptible to malaria infection than those residing in urban areas [ 11 , 26 , 42 , 57 , 58 , 59 , 85 , 89 , 98 ]. However, two studies conducted in Burkina Faso [ 5 ] and Nigeria [ 7 ] reported that UN5 are more vulnerable to malaria infection in urban areas than in rural areas. Moreover, UN5 who walk a long distance to school [ 65 ], whose parents are not living together [ 90 ] and those that stay outdoor for long [ 43 , 67 ] are more likely to be diagnosed with malaria.

Several reviewed studies reported poor housing system as a risk factor for malaria infection amongst children UN5 in SSA [ 26 , 31 , 42 , 65 , 79 , 82 , 83 , 89 ]. For instance, UN5 who live in houses under construction [ 99 ] and houses with poor roofing systems [ 11 ], are vulnerable to malaria parasites. In addition, UN5 in households without electricity [ 11 , 79 ], television [ 41 , 57 ] and toilet [ 11 , 26 ] are at risk of malaria infection. Reviewed studies further reported that households close (< 5 km) to river or stream [ 60 , 66 , 93 , 99 ] and stagnant water [ 43 , 45 , 67 , 76 ], a household with poor sanitation [ 81 ], unclean water [ 38 , 60 , 81 ] and domestic animals [ 26 , 91 ] as well as overcrowded households [ 25 , 57 , 67 , 70 , 90 , 98 ] expose UN5 children to malaria infections. Additionally, UN5 in households that do not use insecticide spray [ 10 , 22 , 26 , 68 , 95 ] or ITN [ 10 , 11 , 14 , 23 , 26 , 27 , 41 , 43 , 46 , 48 , 49 , 53 , 57 , 58 , 70 , 72 , 79 , 80 , 82 , 85 , 96 , 97 , 100 , 101 , 102 , 103 ] are at higher risk of malaria infection.

Pre-existing health conditions, infrastructure and health system

Studies show that pre-existing health conditions make UN5 more vulnerable to malaria infections. For instance, UN5 children diagnosed with fever [ 12 , 37 , 84 , 92 ], splenomegaly [ 15 ], gastro intestinal infection [ 84 ], respiratory tract infection [ 84 ], low immunity anaemia [ 90 ] and previous history of malaria [ 29 , 76 ] are more likely to suffer malaria infections and complications. In addition, delayed care seeking [ 30 , 87 ], the use of herbal medicine [ 87 ], over-the-counter medications [ 12 ] and home management [ 93 ] of suspected malaria cases in UN5 are amongst the factors that make children more likely to suffer from malaria complications. In addition, poor roads [ 87 ] and long distances to health facilities [ 94 ] may prevent mothers of UN5 children from seeking early healthcare. Also, fear of expired drugs might also push mothers to utilise herbal medication [ 94 ]. Furthermore, health system issues such as difficult access to health facilities [ 94 ], medications [ 94 ] and diagnostic test kits [ 22 ] are reported as risk factors for malaria in UN5 in SSA.

Nutrition and climate change

Nutritional issues, such as malnutrition [ 21 , 72 , 80 , 99 ], stunting [ 55 , 84 , 89 ], wasting [ 24 , 72 , 84 ] and lack of micronutrient like iron [ 15 , 39 , 57 , 77 , 103 ] are reported risk factors that complicate malaria cases amongst UN5. However, the linkage between malnutrition and malaria may need more research attention. Furthermore, little evidence suggests that the changing climate might be a risk factor for malaria in UN5. For instance, low altitude [ 14 , 66 , 73 ] and raining season [ 69 ], pose a significant risk of malaria to UN5. Moreover, high altitude has been shown to decrease malaria infection amongst UN5 [ 41 ]. Table 3 presents the risk factors reported by authors organised into themes.

Health education and promotion interventions

Health education and promotion is crucial for malaria prevention amongst UN5 in SSA. For instance, it is well e stablished in the reviewed studies that health promotion interventions that target increased and effective use of ITN [ 10 , 16 , 19 , 20 , 36 , 44 , 47 , 53 , 54 , 55 , 59 , 61 , 63 , 64 , 65 , 70 , 71 , 86 , 88 , 92 , 97 , 103 , 104 , 105 ] and indoor residual spraying (IRS) [ 10 , 19 , 20 , 37 , 44 , 47 , 51 , 53 , 63 , 71 ] have significantly reduced the prevalence of malaria amongst UN5. Furthermore, health promotion activities that ensured malaria vaccination uptake significantly reduced malaria prevalence amongst UN5 in Malawi [ 36 ]. Also, giving nutritional supplements to anaemic UN5 to boost their immunity and reduce malaria infections showed encouraging results in Ghana [ 15 ].

Moreover, health education strategies that focussed on increasing knowledge amongst mothers and caregivers on treatment of malaria cases amongst UN5 in SSA have successfully reduced malaria complications and mortality amongst UN5 [ 10 , 19 , 20 , 37 , 44 , 47 , 51 , 53 , 63 , 71 ]. For example, In Cameroon, educational campaigns targeting mothers and caregivers to access existing free malaria treatments for UN5 led to improved healthcare seeking and decreased hospitalisation for malaria complications amongst UN5 [ 106 ]. Again, in Burkina Faso, the implementation of the free healthcare policy was significantly associated with a twofold increase in the number of tested and confirmed malaria cases compared with the period before the policy rollout [ 22 ].

Finally, health promotion interventions targeting home-based management have shown a significant reduction in malaria prevalence amongst UN5 in SSA [ 51 , 53 , 91 , 105 ]. For example, in Burkina Faso, health promotion intervention through integrated management of malaria in childhood has help mothers rising in far-to reach areas in Burkina Faso to effectively manage malaria cases amongst UN5 [ 105 ].

There is still a high prevalence (between 0.07 and 80.3%) of malaria amongst UN5 in SSA. In addition, low or no formal education, poverty or low income and residing in rural areas are risk factors for malaria infection amongst UN5. Furthermore, the poor housing system in SSA and the unavailability of electricity in rural areas and unclean water make UN5 more susceptible to malaria infections. Finally, well-planned health education and education interventions could be successful in reducing malaria risk amongst UN5 in SSA.

Prevalence of malaria in UN5 in SSA

The high prevalence of UN5 malaria in SSA may be a result of the type and irregular usage of ITNs, the sample used for data collection, the type of diagnostic tests used, climatic conditions, poor treatment of malaria cases amongst UN5 and challenges in implementing existing malaria preventions measures [ 107 ]. For instance, studies that used hospitalised samples reported a high prevalence of malaria amongst UN5 [ 47 , 49 , 50 , 52 ]. Perhaps, the chances of detecting malaria parasites are always higher for hospital samples since most patients may be showing symptoms and signs of a fever [ 107 ], leading to overestimating conditions. It is also established that microscopy produces a lower prevalence than PCR and RDT [ 18 , 81 , 83 ]. Perhaps, may be RDT is highly sensitive and effective in diagnosing latent and active plasmodium infections compared to microscopy [ 108 , 109 ]. Besides, microscopy may produce a high number of false negatives despite its gold standard because of the lack of experienced microscopists and the effect of self-medication which is common in SSA [ 109 ]. It is worth noting that chances of false positives with RDT may be due to high rheumatoid factor in samples [ 109 ]. These issues may cause discrepancies in malaria prevalence amongst UN5. Finally, the huge gap between ITN ownership and usage may account for the high malaria prevalence amongst UN5 in SSA. For example, a recent meta-analysis in SSA shows an average of 75.8% ownership and 58.3% usage of ITN [ 110 ].

Risk factors of malaria infection in UN5 in SSA

The reported relationship between socio-economic factors like education, area of residence, income level and malaria infections amongst UN5 may be due to the effective prevention, diagnosis and treatment options available in SSA. For instance, education is directly associated with productivity and income or earnings. In addition, education increases knowledge and the ability to access malaria information that promotes health [ 111 ]. Perhaps, education and understanding of malaria could translate into the acceptance and practice of malaria prevention interventions that limit infection amongst UN5 in SSA [ 30 ].

It is believed that high income earners provide better housing and nutrition that could be essential in malaria prevention amongst UN5. Also, in SSA, there is a large gap in healthcare access and infrastructure between rural and urban residents [ 112 ]. Thus, UN5 residing in rural and hard-to-reach areas in SSA may have difficulty accessing effective malaria diagnosis and treatment, vaccination and postnatal care [ 112 , 113 ], which could lead to complications and death.

Most reviewed studies that reported age showed that UN5 above 2 years are more vulnerable to malaria infection because in SSA, it is highly possible that when most families have a newborn, resources and attention are shifted from older UN5 to the newborn, thereby making older UN5 susceptible to malaria infection [ 2 ]. Moreover, children under 2 years are likely to get protection from breastfeeding and increased parental attention, which even protects against undernutrition.

Malnutrition is highly prevalent in SSA amongst UN5 because evidence shows that 39, 8 and 28 percent of UN5 are stunted, wasted and underweight, respectively [ 29 ]. Poor nutritional status can lead to immunity suppression, leading to increased risk and poor prognosis of malaria infections amongst UN5 [ 114 ]. However, the link between malnutrition and malaria is complex and studies have yielded contradictory results. For instance, in a recent systematic review, anthropometric parameters were unrelated to malaria incidence or parasite density [ 115 ]. Hence, more quality studies are needed to highlight this complex association.

The findings show that health education and promotion work to increase the uptake of malaria prevention and control in SSA [ 116 , 117 ]. This finding indicates that in resource-limited settings such as SSA, health education and promotion of malaria prevention may be effective and cost-friendly when properly planned and executed. For instance, training and mixed communication methods such as interpersonal communication and mass media on malaria prevention and treatment programmes produced effective results [ 117 ]. However, limited qualitative studies have effectively evaluated health education and promotion interventions targeting UN5 in SSA. Besides, qualitative studies may provide a deeper understanding of the factors that explain the gap between ITN ownership and usage in SSA.

Policy implications

This review has shown that children from low socio-economic backgrounds may be at greater risk of malaria infection than their counterparts. Meanwhile, existing malaria preventions, including treatment, ignores people’s socio-economic background and focus mainly on the distribution of ITN, IRS, larval source management, diagnosis and treatment of malaria cases [ 111 , 116 , 117 , 118 ]. Therefore, the government and policymakers in SSA need to consider improving the socio-economic status of its people as an additional measure to eradicate malaria amongst children effectively. However, there is a variation in socio-economic factors that predispose UN5 to malaria infections in SSA [ 119 ]. As a result, governments and policymakers need to consider multiple policies rather than relying on a single one to reduce or eliminate health disparities to achieve the required results in reducing the malaria burden amongst UN5 in SSA.

Furthermore, there is a need to bridge the equity and inequality gap in healthcare access and infrastructure that exist between rural and urban areas in SSA. Reducing or eliminating this gap means providing accessible, affordable, quality healthcare to rural dwellers. Thus, governments, non-governmental organisations and policymakers should contribute to making malaria prevention, including treatment and diagnosis services, financially and geographically accessible to people in SSA. This intervention should not ignore mothers living in urban slums or poor urban areas and those who live on the street and in displaced and violent communities in SSA.

Reviewed studies indicated that malaria prevention interventions that combine training and interpersonal communication with media, community mobilisation and involvement in interventions effectively reduce malaria infection amongst UN5 in SSA [ 117 ]. Hence, community-based malaria prevention and control interventions should go beyond knowledge enrichment to influencing behavioural changes that may significantly reduce the malaria burden on UN5 in SSA.

Recommendations for future research

There is a need for further exploration of the linkage between malnutrition and malaria infection using high-quality studies such as randomised controlled trials and other epidemiological methods like cohort and longitudinal studies. Furthermore, future studies should focus on qualitative designs that evaluate malaria interventions in SSA that target UN5 for deeper knowledge and understanding of what works and what needs improvement. The linkage between climate change and malaria amongst UN5 in SSA may need quality research attention.

Limitations

This review used only studies published in the English language, which might limit the number of studies that could have enriched the findings of this review. Moreover, most reviewed studies were cross-sectional surveys, so the causal relationship between socio-economic factors and malaria may not be fully established. However, authors retrieved 100 studies from over 20 African countries for this review to help map relevant evidence and provide recommendations for policy actions.

There is still a high prevalence of malaria amongst UN5 in SSA. In addition, socio-economic factors such as low or no formal education, poverty or low income and residing in rural areas are risk factors for malaria infection amongst UN5. However, evidence on age and malnutrition as risk factors for malaria in UN5 is inconsistent and inconclusive. Furthermore, the poor housing system in SSA and the unavailability of electricity in rural areas and unclean water make UN5 more susceptible to malaria infections. Finally, well-planned health education and education interventions could reduce malaria risk amongst UN5 in SSA. Hence, policies that support access to malaria diagnosis, treatment and prevention tools for low income groups and maximise individual and organisational commitment to strengthening malaria control activities may effectively reduce the malaria burden amongst UN5 in SSA.

Availability of data and materials

All resources used in this study are available online and the authors will make them available according to their respective copyright and access policies.

WHO. Malaria. Malaria 2022. https://www.who.int/news-room/fact-sheets/detail/malaria . Accessed 18 Jul 2022.

Obasohan PE, Walters SJ, Jacques R, Khatab K. A scoping review of selected studies on predictor variables associated with the malaria status among children under five years in sub-Saharan Africa. Int J Environ Res Public Health. 2021;18:1–21. https://doi.org/10.3390/ijerph18042119 .

Article   Google Scholar  

UNICEF. Malaria in Africa. Malaria 2021. https://data.unicef.org/topic/child-health/malaria/ . Accessed 18 Jul 2022.

Alemu A, Muluye D, Mihret M, Adugna M, Gebeyaw M. Ten year trend analysis of malaria prevalence in Kola Diba, North Gondar, Northwest Ethiopia. Parasites Vectors. 2012. https://doi.org/10.1186/1756-3305-5-173 .

Article   PubMed   PubMed Central   Google Scholar  

Baragatti M, Fournet F, Henry MC, Assi S, Ouedraogo H, Rogier C, et al. Social and environmental malaria risk factors in urban areas of Ouagadougou, Burkina Faso. Malar J. 2009;8:1–14. https://doi.org/10.1186/1475-2875-8-13/TABLES/5 .

Tela IA, Adamu L, Taura M, Tela IA, Modibbo MH, Adamu LH, et al. Prevalence of malaria infection among ABO blood groups in Jama’are, Nigeria. Res Anal. 2015;1:255–4262.

Google Scholar  

Oladeinde BH, Omoregie R, Osakue EO, Onaiwu TO. Asymptomatic malaria among blood donors in Benin City Nigeria. Iran J Parasitol. 2014;9:415.

PubMed   PubMed Central   Google Scholar  

Owusu-Addo E, Decker A, Owusu-Addo SB. Effectiveness of health education in community-based malaria prevention and control interventions in sub-Saharan:a systematic review. J Biol Agric Healthc 2014;4:22-34

Arksey H, O’Malley L. Scoping studies: towards a methodological framework. Int J Soc Res Methodol Theory Pract. 2005;8:19–32. https://doi.org/10.1080/1364557032000119616 .

Giardina F, Kasasa S, Sié A, Utzinger J, Tanner M, Vounatsou P. Eff ects of vector-control interventions on changes in risk of malaria parasitaemia in sub-Saharan Africa: a spatial and temporal analysis. Lancet Glob Health. 2014. https://doi.org/10.1016/S2214-109X(14)70300-6 .

Article   PubMed   Google Scholar  

Gaston RT, Ramroop S. Prevalence of and factors associated with malaria in children under five years of age in Malawi, using malaria indicator survey data. Heliyon. 2020. https://doi.org/10.1016/j.heliyon.2020.e03946 .

Abuya TO, Mutemi W, Karisa B, Ochola SA, Fegan G, Marsh V. Use of over-the-counter malaria medicines in children and adults in three districts in Kenya: implications for private medicine retailer interventions. Malar J. 2007. https://doi.org/10.1186/1475-2875-6-57 .

Mabunda S, Aponte JJ, Tiago A, Alonso P. A country-wide malaria survey in Mozambique. II. Malaria attributable proportion of fever and establishment of malaria case definition in children across different epidemiological settings. Malar J. 2009. https://doi.org/10.1186/1475-2875-8-74 .

Riedel N, Vounatsou P, Miller JM, Gosoniu L, Chizema-Kawesha E, Mukonka V, et al. Geographical patterns and predictors of malaria risk in Zambia: Bayesian geostatistical modelling of the 2006 Zambia national malaria indicator survey (ZMIS). Malar J. 2010. https://doi.org/10.1186/1475-2875-9-37 .

Crookston BT, Alder SC, Boakye I, Merrill RM, Amuasi JH, Porucznik CA, et al. Exploring the relationship between chronic undernutrition and asymptomatic malaria in Ghanaian children. Malar J. 2010;9:1–7.

Jima D, Getachew A, Bilak H, Steketee RW, Emerson PM, Graves PM, Gebre T, Reithinger R, Hwang J. Malaria indicator survey 2007, Ethiopia: coverage and use of major malaria prevention and control interventions. Malar J. 2010. https://doi.org/10.1186/1475-2875-9-58 .

Tobin-West Charles I, Babatunde S. Community perceptions and practices in management of malaria in under-five children in rivers State in Nigeria. Int J Health Res. 2011;4:127–33.

Ambe JP, Balogun ST, Waziri MB, Nglass IN, Saddiq A. Impacts of seasonal malaria chemoprevention on malaria burden among under five-year-old children in Borno State, Nigeria. J Trop Med. 2020. https://doi.org/10.1155/2020/9372457 .

Mushashu U. Prevalence of malaria infection among under-five and the associated factors in Muleba District-Kagera Region. Masters Dissertation. Muhimbili University of Health and Allied Sciences, 2012. retrieved on February 10 from http://dspace.muhas.ac.tz:8080/xmlui/bitstream/handle/123456789/621/carithasy%20final%20document%20for%20printing.pdf?sequence=1

Chanda P, Hamainza B, Mulenga S, Chalwe V, Msiska C, Chizema-Kawesha E. Early results of integrated malaria control and implications for the management of fever in under-five children at a peripheral health facility: a case study of Chongwe rural health centre in Zambia. Malar J. 2009. https://doi.org/10.1186/1475-2875-8-49 .

Sakwe N, Bigoga J, Ngondi J, Njeambosay B, Esemu L, Kouambeng C, et al. Relationship between malaria, anaemia, nutritional and socio-economic status amongst under-ten children, in the North Region of Cameroon: a cross-sectional assessment. PLoS ONE. 2019. https://doi.org/10.1371/journal.pone.0218442 .

Ouédraogo M, Rouamba T, Samadoulougou S, Kirakoya-Samadoulougou F. Effect of free healthcare policy for children under five years old on the incidence of reported Malaria cases in Burkina Faso by Bayesian modelling: “Not only the ears but also the head of the hippopotamus.” Int J Environ Res Public Health. 2020. https://doi.org/10.3390/ijerph17020417 .

Isah M, Ambe NF, Bobga TP, Ketum AS, Ivan MK, Abungwi MA. Predictors of malaria prevalence and coverage of insecticide-treated bednets among under-five children in the Buea Health District, South West Region, Cameroon. J Biosci Med. 2020;08:25–40. https://doi.org/10.4236/jbm.2020.82003 .

Mmbando BP, Mwaiswelo RO, Chacky F, Molteni F, Mohamed A, Lazaro S, et al. Nutritional status of children under five years old involved in a seasonal malaria chemoprevention study in the Nanyumbu and Masasi districts in Tanzania. PLoS ONE. 2022. https://doi.org/10.1371/journal.pone.0267670 .

Ruyange MM, Condo J, Karema C, Binagwaho A, Rukundo A, Muyirukazi Y. Factors associated with the non-use of insecticide-treated nets in Rwandan children. Malar J. 2016. https://doi.org/10.1186/s12936-016-1403-6 .

Semakula HM, Song G, Achuu SP, Zhang S. A Bayesian belief network modelling of household factors influencing the risk of malaria: a study of parasitaemia in children under five years of age in sub-Saharan Africa. Environ Model Softw. 2016;75:59–67. https://doi.org/10.1016/j.envsoft.2015.10.006 .

Levitz L, Janko M, Mwandagalirwa K, Thwai KL, Likwela JL, Tshefu AK, et al. Effect of individual and community-level bed net usage on malaria prevalence among under-fives in the Democratic Republic of Congo. Malar J. 2018. https://doi.org/10.1186/s12936-018-2183-y .

Taffese HS, Hemming-Schroeder E, Koepfli C, Tesfaye G, Lee M, Kazura J, et al. Malaria Epidemiology and interventions in Ethiopia from 2001 to 2016. Infect Dis Poverty. 2001. https://doi.org/10.1186/s40249-018-0487-3 .

Gone T, Lemango F, Eliso E, Yohannes S, Yohannes T. The association between malaria and malnutrition among under-five children in Shashogo District, Southern Ethiopia: a case-control study. Infect Dis Poverty. 2017. https://doi.org/10.1186/s40249-016-0221-y .

Babalola OJ, Ajumobi O, Ajayi IOO. Rural-urban disparities and factors associated with delayed care-seeking and testing for malaria before medication use by mothers of under-five children, Igabi LGA, Kaduna Nigeria. Malar J. 2020. https://doi.org/10.1186/s12936-020-03371-w .

Woolley KE, Bartington SE, Pope FD, Greenfield SM, Tusting LS, Price MJ, et al. Cooking outdoors or with cleaner fuels does not increase malarial risk in children under 5 years: a cross-sectional study of 17 sub-Saharan African countries. Malar J. 2022. https://doi.org/10.1186/s12936-022-04152-3 .

Issiaka D, Barry A, Traore T, Diarra B, Cook D, Keita M, et al. Impact of seasonal malaria chemoprevention on hospital admissions and mortality in children under 5 years of age in Ouelessebougou, Mali. Malar J. 2020. https://doi.org/10.1186/s12936-020-03175-y .

Ashton RA, Doumbia B, Diallo D, Druetz T, Florey L, Taylor C, et al. Measuring malaria diagnosis and treatment coverage in population-based surveys: a recall validation study in Mali among caregivers of febrile children under 5 years. Malar J. 2019. https://doi.org/10.1186/s12936-018-2636-3 .

Israel OK, Fawole OI, Adebowale AS, Ajayi IO, Yusuf OB, Oladimeji A, et al. Caregivers’ knowledge and utilization of long-lasting insecticidal nets among under-five children in Osun State, Southwest, Nigeria. Malar J. 2018. https://doi.org/10.1186/s12936-018-2383-5 .

Drakeley C, Abdulla S, Agnandji ST, Fernandes JF, Kremsner P, Lell B, et al. Longitudinal estimation of Plasmodium falciparum prevalence in relation to malaria prevention measures in six sub-Saharan African countries NCT01190202 NCT. 2017. Malar J. https://doi.org/10.1186/s12936-017-2078-3 .

Escamilla V, Alker A, Dandalo L, Juliano JJ, Miller WC, Kamthuza P, et al. Effects of community-level bed net coverage on malaria morbidity in Lilongwe, Malawi. Malar J. 2017. https://doi.org/10.1186/s12936-017-1767-2 .

Carlucci JG, Blevins Peratikos M, Cherry CB, Lopez ML, Green AF, González-Calvo L, et al. Prevalence and determinants of malaria among children in Zambézia Province, Mozambique. Malar J. 2017;16:1–13. https://doi.org/10.1186/s12936-017-1741-z .

Kateera F, Ingabire CM, Hakizimana E, Kalinda P, Mens PF, Grobusch MP, et al. Malaria, anaemia and under-nutrition: Three frequently co-existing conditions among preschool children in rural Rwanda. Malar J. 2015. https://doi.org/10.1186/s12936-015-0973-z .

Wanzira H, Katamba H, Okullo AE, Agaba B, Kasule M, Rubahika D. Factors associated with malaria parasitaemia among children under 5 years in Uganda: a secondary data analysis of the 2014 Malaria Indicator Survey dataset. Malar J. 2017;16. https://doi.org/10.1186/s12936-017-1847-3 .

Kombate G, Gmakouba W, Scott S, Azianu KA, Ekouevi DK, van der Sande MAB. Regional heterogeneity of malaria prevalence and associated risk factors among children under five in Togo: evidence from a national malaria indicators survey. Malar J. 2022. https://doi.org/10.1186/s12936-022-04195-6 .

Aychiluhm SB, Gelaye KA, Angaw DA, Dagne GA, Tadesse AW, Abera A, et al. Determinants of malaria among under-five children in Ethiopia: Bayesian multilevel analysis. BMC Public Health. 2020. https://doi.org/10.1186/s12889-020-09560-1 .

Nwaneli EI, Eguonu I, Ebenebe JC, Osuorah CDI, Ofiaeli OC, Nri-Ezedi CA. Malaria prevalence and its sociodemographic determinants in febrile children—a hospital-based study in a developing community in South-East Nigeria. J Prevent Med Hyg. 2020;61:E173–80. https://doi.org/10.15167/2421-4248/jpmh2020.61.2.1350 .

Article   CAS   Google Scholar  

Tsegaye AT, Ayele A, Birhanu S. Prevalence and associated factors of malaria in children under the age of five years in Wogera district, northwest Ethiopia: a cross-sectional study. PLoS ONE. 2021. https://doi.org/10.1371/journal.pone.0257944 .

Emina JBO, Doctor HV, Yé Y. Profiling malaria infection among under-five children in the Democratic Republic of Congo. PLoS ONE. 2021. https://doi.org/10.1371/journal.pone.0250550 .

Abossie A, Yohanes T, Nedu A, Tafesse W, Damitie M. Prevalence of malaria and associated risk factors among febrile children under five years: a cross-sectional study in arba minch zuria district, south Ethiopia. Infect Drug Resist. 2020;13:363–72. https://doi.org/10.2147/IDR.S223873 .

Houmsou R. Occurrence of malaria in children under five years: knowledge, attitudes and perceptions among mothers in a Nigerian semi-urban area. J Sci Res Rep. 2014;3:1127–34. https://doi.org/10.9734/jsrr/2014/7559 .

Kiggundu VL, O’Meara WP, Musoke R, Nalugoda FK, Kigozi G, Baghendaghe E, et al. High prevalence of malaria parasitemia and anemia among hospitalized children in Rakai Uganda. PLoS ONE. 2013. https://doi.org/10.1371/journal.pone.0082455 .

Zgambo M, Mbakaya BC, Kalembo FW. Prevalence and factors associated with malaria parasitaemia in children under the age of five years in Malawi: a comparison study of the 2012 and 2014 Malaria Indicator Surveys (MISs). PLoS ONE. 2017. https://doi.org/10.1371/journal.pone.0175537 .

Iloh GUP, Nnorom OU, Amadi A. Malaria morbidity among under-five Nigerian children: a study of its prevalence and health practices of primary care givers (mothers) in a resource-poor setting of a rural hospital in Eastern Nigeria. Eur J Prevent Med. 2013;1:50.

Dzeing-Ella A, Obiang PCN, Tchoua R, Planche T, Mboza B, Mbounja M, et al. Severe falciparum malaria in Gabonese children: clinical and laboratory features. Malar J. 2005. https://doi.org/10.1186/1475-2875-4-1 .

Nyirakanani C, Chibvongodze R, Habtu M, Masika M, Mukoko D, Njunwa KJ. Prevalence and risk factors of asymptomatic malaria among under-five children in Huye District, Southern Rwanda. Tanzania J Health Res. 2018. https://doi.org/10.4314/thrb.v20i1.6 .

Elechi H, Rabasa A, Muhammad F, Garba M, Abubakar G, Umoru M. Prevalence and pattern of malaria parasitaemia among under-five febrile children attending paediatric out-patient clinic at university of Maiduguri Teaching Hospital, Maiduguri. Niger J Paediatr. 2015;42:319. https://doi.org/10.4314/njp.v42i4.7 .

Kyu HH, Georgiades K, Shannon HS, Boyle MH. Evaluation of the association between long-lasting insecticidal nets mass distribution campaigns and child malaria in Nigeria. Malar J. 2013. https://doi.org/10.1186/1475-2875-12-14 .

Mawili-Mboumba DP, Bouyou Akotet MK, Kendjo E, Nzamba J, Owono Medang M, Mourou Mbina J-R, et al. Increase in malaria prevalence and age of at risk population in different areas of Gabon. Malar J. 2013;12:1–7.

Arinaitwe E, Gasasira A, Verret W, Homsy J, Wanzira H, Kakuru A, et al. The association between malnutrition and the incidence of malaria among young HIV-infected and -uninfected Ugandan children: a prospective study. Malar J. 2012. https://doi.org/10.1186/1475-2875-11-90 .

Choge JK, Magak NG, Akhwale W, Koech J, Ngeiywa MM, Oyoo-Okoth E, et al. Symptomatic malaria diagnosis overestimate malaria prevalence, but underestimate anaemia burdens in children: results of a follow up study in Kenya. BMC Public Health. 2014. https://doi.org/10.1186/1471-2458-14-332 .

Aheto JMK, Duah HO, Agbadi P, Nakua EK. A predictive model, and predictors of under-five child malaria prevalence in Ghana: how do LASSO, Ridge and Elastic net regression approaches compare? Prevent Med Rep. 2021. https://doi.org/10.1016/j.pmedr.2021.101475 .

Paul E, Msengwa AS. Prevalence and socio-demographic factors associated with malaria infection among children under five years in Tanzania. J Public Health Epidemiol. 2018;10:387–94. https://doi.org/10.5897/jphe2018.1055 .

Ssempiira J, Nambuusi B, Kissa J, Agaba B, Makumbi F, Kasasa S, et al. Geostatistical modelling of malaria indicator survey data to assess the effects of interventions on the geographical distribution of malaria prevalence in children less than 5 years in Uganda. PLoS ONE. 2017. https://doi.org/10.1371/journal.pone.0174948 .

Hajison PL, Feresu SA, Mwakikunga BW. Malaria in children under-five: a comparison of risk factors in lakeshore and highland areas, Zomba district, Malawi. PLoS ONE. 2018. https://doi.org/10.1371/journal.pone.0207207 .

Smithson P, Florey L, Salgado SR, Hershey CL, Masanja H, Bhattarai A, et al. Impact of malaria control on mortality and anemia among Tanzanian children less than five years of age, 1999–2010. PLoS ONE. 2015. https://doi.org/10.1371/journal.pone.0141112 .

Kangwana BP, Kedenge SV, Noor AM, Alegana VA, Nyandigisi AJ, Pandit J, et al. The impact of retail-sector delivery of artemether-lumefantrine on malaria treatment of children under five in Kenya: a cluster randomized controlled trial. PLoS Med. 2011. https://doi.org/10.1371/journal.pmed.1000437 .

West PA, Protopopoff N, Rowland M, Cumming E, Rand A, Drakeley C, et al. Malaria risk factors in North West Tanzania: the effect of spraying, nets and wealth. PLoS ONE. 2013. https://doi.org/10.1371/journal.pone.0065787 .

Abegunde D, Orobaton N, Bassi A, Oguntunde O, Bamidele M, Abdulkrim M, et al. The impact of integrated community case management of childhood diseases interventions to prevent malaria fever in children less than five years old in Bauchi State of Nigeria. PLoS ONE. 2016. https://doi.org/10.1371/journal.pone.0148586 .

Habyarimana F, Ramroop S. Prevalence and risk factors associated with malaria among children aged six months to 14 years old in Rwanda: evidence from 2017 Rwanda malaria indicator survey. Int J Environ Res Public Health. 2020;17:1–13. https://doi.org/10.3390/ijerph17217975 .

Ugwu CLJ, Zewotir T. Evaluating the effects of climate and environmental factors on under-5 children malaria spatial distribution using generalized additive models (GAMs). J Epidemiol Glob Health. 2020;10:304–14. https://doi.org/10.2991/jegh.k.200814.001 .

Ahmed A, Mulatu K, Elfu B. Prevalence of malaria and associated factors among under-five children in Sherkole refugee camp, Benishangul-Gumuz region, Ethiopia. A cross-sectional study. PLoS ONE. 2021. https://doi.org/10.1371/journal.pone.0246895 .

Afoakwah C, Nunoo J, Andoh FK. Effect of insecticide-treated bed net usage on under-five mortality in northern Ghana. Malar J. 2015. https://doi.org/10.1186/s12936-015-0827-8 .

Chiabi A, Djimafo ANM, Nguefack S, Mah E, Nguefack Dongmo F, Angwafo F. Severe malaria in Cameroon: pattern of disease in children at the Yaounde Gynaeco-Obstetric and Pediatric hospital. J Infect Public Health. 2020;13:1469–72. https://doi.org/10.1016/j.jiph.2020.02.038 .

de Beaudrap P, Nabasumba C, Grandesso F, Turyakira E, Schramm B, Boum Y, et al. Heterogeneous decrease in malaria prevalence in children over a six-year period in south-western Uganda. Malar J. 2011. https://doi.org/10.1186/1475-2875-10-132 .

Mwaiswelo RO, Mmbando BP, Chacky F, Molteni F, Mohamed A, Lazaro S, et al. Malaria infection and anemia status in under-five children from Southern Tanzania where seasonal malaria chemoprevention is being implemented. PLoS ONE. 2021. https://doi.org/10.1371/journal.pone.0260785 .

Shikur B, Deressa W, Lindtjørn B. Association between malaria and malnutrition among children aged under-five years in Adami Tulu District, south-central Ethiopia: a case-control study. BMC Public Health. 2016. https://doi.org/10.1186/s12889-016-2838-y .

Kweku M, Takramah W, Axame WK, Owusu R, Takase M, Adjuik M, et al. Prevalence and risk factors of malaria among children under five years in High and Low altitude rural communities in the Hohoe Municipality of Ghana. J Clin Immunol Res. 2017;1:1–8.

Kweku M, Ofori M, Appiah E, Dinko B, Takramah W, Agboli E, et al. Seasonal prevalence of malaria, fever, anaemia and factors associated with malaria prevalence among children less than five in an area with prolonged malaria transmission in Ghana. Int J Trop Dis Health. 2017;22:1–11. https://doi.org/10.9734/ijtdh/2017/31371 .

Papaioannou I, Utzinger J, Vounatsou P. Malaria-anemia comorbidity prevalence as a measure of malaria-related deaths in sub-Saharan Africa. Sci Rep. 2019. https://doi.org/10.1038/s41598-019-47614-6 .

Dao F, Djonor SK, Ayin CTM, Adu GA, Sarfo B, Nortey P, et al. Burden of malaria in children under five and caregivers’ health-seeking behaviour for malaria-related symptoms in artisanal mining communities in Ghana. Parasites Vectors. 2021. https://doi.org/10.1186/s13071-021-04919-8 .

Morakinyo OM, Balogun FM, Fagbamigbe AF. Housing type and risk of malaria among under-five children in Nigeria: evidence from the malaria indicator survey. Malar J. 2018. https://doi.org/10.1186/s12936-018-2463-6 .

Mfueni E, Devleesschauwer B, Rosas-Aguirre A, van Malderen C, Brandt PT, Ogutu B, et al. True malaria prevalence in children under five: Bayesian estimation using data of malaria household surveys from three sub-Saharan countries. Malar J. 2018. https://doi.org/10.1186/s12936-018-2211-y .

Roberts D, Matthews G. Risk factors of malaria in children under the age of five years old in Uganda. Malar J. 2016. https://doi.org/10.1186/s12936-016-1290-x .

Maketa V, Mavoko HM, da Luz RI, Zanga J, Lubiba J, Kalonji A, et al. The relationship between Plasmodium infection, anaemia and nutritional status in asymptomatic children aged under five years living in stable transmission zones in Kinshasa, Democratic Republic of Congo. Malar J. 2015. https://doi.org/10.1186/s12936-015-0595-5 .

Yang D, He Y, Wu B, Deng Y, Li M, Yang Q, et al. Drinking water and sanitation conditions are associated with the risk of malaria among children under five years old in sub-Saharan Africa: a logistic regression model analysis of national survey data. J Adv Res. 2020;21:1–13. https://doi.org/10.1016/j.jare.2019.09.001 .

Tusting LS, Bottomley C, Gibson H, Kleinschmidt I, Tatem AJ, Lindsay SW, et al. Housing improvements and malaria risk in sub-Saharan Africa: a multi-country analysis of survey data. PLoS Med. 2017. https://doi.org/10.1371/journal.pmed.1002234 .

Bah MS. The relationship between malaria status in under-five children and some household demographic, socioeconomic and environmental factors associated with the disease in Sierra Leone. Georgia State University, 2020. https://doi.org/10.57709/17625877 .

Gahutu JB, Steininger C, Shyirambere C, Zeile I, Cwinya-Ay N, Danquah I, et al. Prevalence and risk factors of malaria among children in southern highland Rwanda. Malar J. 2011. https://doi.org/10.1186/1475-2875-10-134 .

Noor AM, Gething PW, Alegana VA, Patil AP, Hay SI, Muchiri E, et al. The risks of malaria infection in Kenya in 2009. BMC Infect Dis. 2009. https://doi.org/10.1186/1471-2334-9-180 .

Clouston SAP, Yukich J, Anglewicz P. Social inequalities in malaria knowledge, prevention and prevalence among children under 5 years old and women aged 15–49 in Madagascar. Malar J. 2015. https://doi.org/10.1186/s12936-015-1010-y .

Chukwuocha UM, Okpanma AC, Nwakwuo GC, Dozie INS. Determinants of delay in seeking malaria treatment for children under-five years in parts of South Eastern Nigeria. J Community Health. 2014;39(6):1171–8. https://doi.org/10.1007/S10900-014-9872-4 .

Uhomoibhi P, Okoronkwo C, Ajayi IOO, Mokuolu O, Maikore I, Fagbamigbe A, et al. Drivers of long-lasting insecticide-treated net utilisation and parasitaemia among under-five children in 13 States with high malaria burden in Nigeria. PLoS ONE. 2022. https://doi.org/10.1371/journal.pone.0268185 .

Mann DM, Swahn MH, McCool S. Undernutrition and malaria among under-five children: findings from the 2018 Nigeria demographic and health survey. Pathogens Glob Health. 2021;115:423–33. https://doi.org/10.1080/20477724.2021.1916729 .

Iloh GP, Chuku A, Amadi A, Ofoedu J. Proximate family biosocial variables associated with severe malaria disease among under-five children in resource-poor setting of a rural hospital in eastern Nigeria. J Fam Med Primary Care. 2013;2:256. https://doi.org/10.4103/2249-4863.120739 .

Malik EM, Hanafi K, Ali SH, Ahmed ES, Mohamed KA. Treatment-seeking behaviour for malaria in children under five years of age: implication for home management in rural areas with high seasonal transmission in Sudan. Malar J. 2006. https://doi.org/10.1186/1475-2875-5-60 .

Oresanya OB, Hoshen M, Sofola OT. Utilization of insecticide-treated nets by under-five children in Nigeria: assessing progress towards the Abuja targets. Malar J. 2008. https://doi.org/10.1186/1475-2875-7-145 .

Silweya D, Baboo KS. Barriers to prompt malaria treatment among under five children in Mpika District. Med J Zambia 2013;40:121–125

Chibwana AI, Mathanga DP, Chinkhumba J, Campbell CH. Socio-cultural predictors of health-seeking behaviour for febrile under-five children in Mwanza-Neno district, Malawi. Malar J. 2009. https://doi.org/10.1186/1475-2875-8-219 .

Yankson R, Anto EA, Chipeta MG. Geostatistical analysis and mapping of malaria risk in children under 5 using point-referenced prevalence data in Ghana. Malar J. 2019. https://doi.org/10.1186/s12936-019-2709-y .

Afoakwah C, Deng X, Onur I. Malaria infection among children under-five: the use of large-scale interventions in Ghana. BMC Public Health. 2018. https://doi.org/10.1186/s12889-018-5428-3 .

Nkoka O, Chipeta MS, Chuang YC, Fergus D, Chuang KY. A comparative study of the prevalence of and factors associated with insecticide-treated nets usage among children under 5 years of age in households that already own nets in Malawi. Malar J. 2019. https://doi.org/10.1186/s12936-019-2667-4 .

Oguoma VM, Anyasodor AE, Adeleye AO, Eneanya OA, Mbanefo EC. Multilevel modelling of the risk of malaria among children aged under five years in Nigeria. Trans R Soc Trop Med Hyg. 2021;115:482–94. https://doi.org/10.1093/trstmh/traa092 .

Article   CAS   PubMed   Google Scholar  

Mutsigiri-Murewanhema F, Mafaune PT, Shambira G, Juru T, Bangure D, Mungati M, et al. Factors associated with severe malaria among children below ten years in Mutasa and Nyanga districts, Zimbabwe, 2014-2015. Pan Afr Med J. 2017. https://doi.org/10.11604/pamj.2017.27.23.10957 .

Owoeye DO, Akinyemi JO, Yusuf OB. Decomposition of changes in malaria prevalence amongst under-five children in Nigeria. Malar World J 2018;9:1–6

Nyarko SH, Cobblah A. Sociodemographic determinants of malaria among under-five children in Ghana. Malar Res Treat. 2014. https://doi.org/10.1155/2014/304361 .

Konlan KD, Japiong M, Konlan KD, Afaya A, Salia SM, Kombat JM. Utilization of Insecticide Treated Bed Nets (ITNs) among caregivers of children under five years in the Ho municipality. Interdiscipl Perspect Infect Dis. 2019. https://doi.org/10.1155/2019/3693450 .

Kweku M, Appiah EK, Enuameh Y, Adjuik M, Takramah W, Tarkang E, et al. The impact of malaria control interventions on malaria and anaemia in children under five after ten years of implementation in the Hohoe Municipality of Ghana. Adv Infect Dis. 2017;07:93–105. https://doi.org/10.4236/aid.2017.73010 .

Nyavor KD, Kweku M, Agbemafle I, Takramah W, Norman I, Tarkang E, et al. Assessing the ownership, usage and knowledge of insecticide treated nets (ITNs) in malaria prevention in the hohoe municipality, Ghana. Pan Afr Med J. 2017. https://doi.org/10.11604/pamj.2017.28.67.9934 .

Diabaté S, Druetz T, Millogo T, Ly A, Fregonese F, Kouanda S, et al. Domestic larval control practices and malaria prevalence among under-five children in Burkina Faso. PLoS ONE. 2015. https://doi.org/10.1371/journal.pone.0141784 .

Nkwenti HE, Ngowe MN, Fokam P, Fonyuy JN, Atanga SN, Nkfusai NC, et al. The effect of subsidized malaria treatment among under-five children in the buea health district Cameroon. Pan Afr Med J. 2019. https://doi.org/10.11604/pamj.2019.33.152.16832 .

Tegegne Y, Worede A, Derso A, Ambachew S. The prevalence of malaria among children in Ethiopia: a systematic review and meta-analysis. J Parasitol Res. 2021. https://doi.org/10.1155/2021/6697294 .

Manjurano A, Omolo JJ, Lyimo E, Miyaye D, Kishamawe C, Matemba LE, et al. Performance evaluation of the highly sensitive histidine-rich protein 2 rapid test for plasmodium falciparum malaria in North-West Tanzania. Malar J. 2021;20:1–9. https://doi.org/10.1186/S12936-020-03568-Z/FIGURES/3 .

Dahal P, Khanal B, Rai K, Kattel V, Yadav S, Bhattarai NR. Challenges in laboratory diagnosis of malaria in a low-resource country at tertiary care in Eastern Nepal: a comparative study of conventional vs. molecular methodologies. J Trop Med. 2021. https://doi.org/10.1155/2021/3811318 .

Tamgnoa DE, Nguefack-Tsaguec G, Tiotsa TA, E ZM, O E, M SS. Insecticide-treated net use in sub-Saharan Africa: systematic review and meta-analysis. Igiene e Sanita Pubblica 2021;78:564–582.

Degarege A, Fennie K, Degarege D, Chennupati S, Madhivanan P. Improving socioeconomic status may reduce the burden of malaria in sub Saharan Africa: a systematic review and meta-analysis. PLoS ONE. 2019. https://doi.org/10.1371/journal.pone.0211205 .

Samuel O, Zewotir T, North D. Decomposing the urban–rural inequalities in the utilisation of maternal healthcare services: evidence from 27 selected countries in Sub-Saharan Africa. Reprod Health. 2021;18:1–12. https://doi.org/10.1186/S12978-021-01268-8/TABLES/4 .

Adamu AA, Uthman OA, Sambala EZ, Ndwandwe D, Wiyeh AB, Olukade T, et al. Rural-urban disparities in missed opportunities for vaccination in sub-Saharan Africa: a multi-country decomposition analyses. Hum Vaccin Immunother. 2019;15:1191–8. https://doi.org/10.1080/21645515.2019.1575163 .

Wilson AL, Bradley J, Kandeh B, Salami K, D’Alessandro U, Pinder M, et al. Is chronic malnutrition associated with an increase in malaria incidence? A cohort study in children aged under 5 years in rural Gambia. Parasit Vectors. 2018;11:1–11. https://doi.org/10.1186/S13071-018-3026-Y/TABLES/6 .

Ferreira EDA, Alexandre MA, Salinas JL, de Siqueira AM, Benzecry SG, de Lacerda MVG, et al. Association between anthropometry-based nutritional status and malaria: a systematic review of observational studies. Malar J. 2015. https://doi.org/10.1186/S12936-015-0870-5 .

Inungu JN, Ankiba N, Minelli M, Mumford V, Bolekela D, Mukoso B, et al. Use of insecticide-treated mosquito net among pregnant women and guardians of children under five in the Democratic Republic of the Congo. Malar Res Treat. 2017. https://doi.org/10.1155/2017/5923696 .

Dongmo EK, Nicholas T, Dickson SN. Impact of the home-based management of malaria on morbidity and mortality in under-five children in Penka-Michel and Santchou Health Districts of Cameroon. J Public Health Epidemiol. 2021;13:30–7. https://doi.org/10.5897/jphe2020.1292 .

Do M, Babalola S, Awantang G, Toso M, Lewicky N, Tompsett A. Associations between malaria-related ideational factors and care-seeking behavior for fever among children under five in Mali, Nigeria, and Madagascar. PLoS ONE. 2018. https://doi.org/10.1371/journal.pone.0191079 .

Mfueni Bikundi E, Coppieters Y. Importance of risk factors associated with malaria for Sub-Saharan African children. Int J Environ Health Res. 2017;27:394–408. https://doi.org/10.1080/09603123.2017.1359241 .

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We are grateful to the authors and organisations who made their resources freely available to us. Moreover, we appreciate the kind efforts of reviewers and editors who assisted our work. Finally, we are thankful to Dr. Kwame Kodua-Ntim for his immense assistance.

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Jacob Owusu Sarfo, Mustapha Amoadu, Peace Yaa Kordorwu, Abdul Karim Adams, Thomas Boateng Gyan, Abdul-Ganiyu Osman, Immanuel Asiedu & Edward Wilson Ansah

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JOS, MA, PYK, AKA, TBG, A-GO and IA conceptualised and designed the study, collected and analyzed the data and wrote the initial draft. EWA was an independent researcher who guided the team throughout the review process. All authors read and approved the final manuscript.

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Data extraction for included studies.

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Sarfo, J.O., Amoadu, M., Kordorwu, P.Y. et al. Malaria amongst children under five in sub-Saharan Africa: a scoping review of prevalence, risk factors and preventive interventions. Eur J Med Res 28 , 80 (2023). https://doi.org/10.1186/s40001-023-01046-1

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Received : 12 October 2022

Accepted : 06 February 2023

Published : 17 February 2023

DOI : https://doi.org/10.1186/s40001-023-01046-1

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• Children under five
• Risk factors
• Sub-Saharan Africa
• Scoping review

European Journal of Medical Research

ISSN: 2047-783X

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