In this post, we present the current focus of the COVID-19 literature, based on publications registered in PubMed as published from March 8th to April 4th. During this time, there were 9653 publications, and 637 keywords occurred in ten or more manuscripts. The keywords divided into 5 clusters. To create the map, we used the LinLog method.
In the table below, we have listed the 10 most central keywords in each cluster.
| Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 | Cluster 5 |
| Aged, 80 and over | Cross-sectional studies | Covid-19 vaccines | Animals | Adolescent |
| Risk factor | Surveys and questionnaires | United States | Antibodies, viral | Children |
| Retrospective studies | Communicable disease control | Public health | Antiviral agents | Child, preschool |
| Hospitalization | Anxiety | Covid-19 testing | Spike glycoprotein, coronavirus | Infant |
| Severity of illness index | Mental health | Telemedicine | Lung | Pregnancy |
| Comorbidity | Quarantine | Epidemiology | Antibodies, neutralizing | Schools |
| Age factors | China | United Kingdom | Immunoglobulin g | Age distribution |
| Cohort studies | Depression | Vaccination | Angiotensin-converting enzyme 2 | Pregnancy complications, infectious |
| Treatment outcome | Health personnel | Disease outbreaks | RNA, viral | Systemic inflammatory response syndrome |
| Prospective studies | Italy | Time factors | Covid-19 nucleic acid testing | Family characteristics |
To open the map directly in VOSviewer, please use the Keyword co-occurrence MAP and NET files from March, available through the Open Science Foundation (OSF) repository: https://osf.io/54gqw/