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/