Bibliometric analyses of COVID-19 research
Applications for the bibliometric Co-occurrence analysis:
- Offers an overview of:
- the structure of topics investigated,
- the relative focus, as measured by the number of occurrences, shown as the size of nodes.
- The different colors indicate different general research foci.
- Identifying the most relevant search terms.
- The keywords in the map are those commonly used by article authors, with differences across the research areas. Identifying the most relevant terms can help narrow the search to the most relevant articles.
To access the interactive map, you need to open the graph in VosViewer, which allows you to search the map, see what keywords are connected, and the strength of the connection between each node in the graph diagram. To open the map in VosViewer, Please click here, and allow it to download, then open the file and allow Java to run. For a video demonstration of how to do this, please see here.
For more information about what a bibliometric keyword co-occurrence analysis is, please see the About page. The data is downloaded from PubMed.
Insights and trends
Some insights from the weekly bibliometric keyword co-occurrence analyses conducted since March 2020 include that there has been a very rapid increase in COVID-19 literature. From 992 on March 16th, when we initiated this project, to over 50 000 now. Below we refer to some insights and trends. For more details, please read the individual blog posts.
Early in the pandemic, the research focus, based on 1323 publications on March 23rd, was on topics within “Health and pandemic management,” “The disease and its pathophysiology,” “Clinical epidemiology of the disease,” and “Treatment of the disease”. Please see the preprint for a more detailed description
About a month later, on April 20th, the number of publications had increased with 395%; to 5228. Moreover, the research landscape had changed somewhat. The topics studied can be described as 1) «A global virus pandemic» including topics within “preventive epidemiology” and “care management.” 2) “Disease epidemiology,” 3) “Pathophysiology and origin,” including topics within “viral biology” and “drug treatment”, 4) “Clinical epidemiology”, and 5) a fifth cluster includes topics on mental health and attitudes. The topic of mental health starts to emerge as a research focus within the COVID-19 pandemic research. During March and April, several countries have introduced strict social distancing measures to reduce the spread of the covid-19 virus. New research focuses on how the pandemic affects people’s mental health and feelings of isolation and loneliness. For more details, click here
On July 23rd, the focus of the most recent literature was on 1) Public health strategies, treatment, and the global impact of COVID-19, 2) the role of existing drugs and vaccines in the current pandemic, 3) demographics and risk factors, 4) literature concentrated on understanding the nature of the virus, and 5) COVID-19 and mental health. For more details, check out this post
For an illustration of the change in research trends across the very early stages of the pandemic and later stages, please see our post from September 23rd: Click here
Growth in number of documents by week:
|Date||Nr. of docs in PubMed|
Keyword Co-Occurrence Network Graph for the Overall Research Field on COVID-19 up to March 16th, 2020.
Corpus downloaded from PubMed 16th March: 992 publications)
The table below provides an overview of the most central keywords from each of the clusters in the keyword co-occurrence network graph above.
Table of most central keywords in each cluster from the network graph:
Clinical analysis and treatment
Categorization of epidemic
Epidemiology and Global spread
Prognosis for population groups
Origin and definition
Social prevention measures
|novel coronavirus pneumonia||epidemic||case definition||middle aged||viruses||disease outbreaks|
|public health||pregnancy||emerging infectious diseases||male||wuhan||united states|
|diagnosis||infant||acute respiratory disease||viral pneumonia||zoonosis||centers for disease control and prevention, u.s.|
|treatment||bat||importation||aged||respiratory infections||contact tracing|
|infectious diseases||pandemic||travel||children||transmission||travel-related illness|
|clinical characteristics||ace2||isolation||radiography, thoracic||respiratory disease||risk assessment|
|influenza||wuhan pneumonia||quarantine||young adult||cluster||practice guidelines as topic|
|clinical features||exposure||migration||prognosis||mathematical model||infection control|