In this post, we present the current focus of the COVID-19 literature, based on publications registered in PubMed as published from April 5th to May 2nd, as well as all articles published up to this date.

The analysis of all research in PubMed up to 2nd May, is based on 125 521 pulications, which gave 4160 keywords that appear in 10 or more manuscripts, that divide into 6 cluster.

The first four clusters are reasonably similar in size, while cluster 5 is about 60% of the size of cluster 1, and cluster six only has 24 terms.

Cluster 1 Cluster 2 Cluster 3 Cluster 4 Cluster 5 Cluster 6
Nr. terms in cluster 1020 909 824 802 581 24
sars risk factor public health telemedicine children anosmia
animals aged, 80 and over china infection control adolescent recovery
infection retrospective studies united states personal protective equipment cross-sectional studies smell
antiviral agents hospitalization infectious diseases delivery of health care quarantine olfaction disorders
inflammation mortality epidemiology prevention surveys and questionnaires ageusia
viruses comorbidity disease outbreaks masks mental health dysgeusia
vaccine severity of illness index communicable disease control neoplasms stress taste
clinical laboratory techniques pneumonia time factors cancer health personnel hyposmia
ace2 risk assessment global health safety pregnancy taste disorders
hydroxychloroquine treatment outcome covid-19 vaccines practice guidelines as topic infant symptom
cytokines intensive care units health policy hospitals anxiety olfaction
antibodies, viral critical care united kingdom pediatrics child, preschool olfactory dysfunction
spike glycoprotein, coronavirus prognosis covid-19 testing ambulatory care depression olfactory
treatment prospective studies epidemic cross infection prevalence allergic rhinitis
rna, viral lung india education lockdown epidemiological
diagnosis age factors incidence emergency service, hospital spain smell loss
mers cohort studies vaccination triage social distancing rhinitis
cytokine storm biomarkers physical distancing primary healthcare social isolation gustatory dysfunction
angiotensin-converting enzyme 2 diabetes mellitus brazil infectious disease transmission, patient-to-professional healthcare workers olfactory bulb
respiratory infections respiration, artificial communication patient safety quality of life taste loss


For the month of April 2021:

During this time, there were 8976 publications, and 503 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 Cluster 6
Nr. terms in cluster 133 128 114 91 31 6
aged, 80 and over cross-sectional studies covid-19 vaccines animals adolescent air pollution
retrospective studies surveys and questionnaires public health antibodies, viral children particulate matter
risk factor communicable disease control vaccination antiviral agents infant air pollutants
hospitalization mental health vaccine spike glycoprotein, coronavirus child, preschool environmental monitoring
china anxiety covid-19 testing covid-19 nucleic acid testing united states temperature
comorbidity depression epidemiology angiotensin-converting enzyme 2 pregnancy air quality
severity of illness index health personnel incidence rna, viral socioeconomic factors
age factors quarantine disease outbreaks immunoglobulin g health status disparities
intensive care units telemedicine global health covid-19 serological testing schools
inflammation stress, psychological physical distancing antibody pregnancy complications, infectious
mortality lockdown health policy coronavirus infection ethnic groups
prospective studies spain india sensitivity and specificity social determinants of health
cohort studies health knowledge, attitudes, practice infection control antibodies, neutralizing systemic inflammatory response syndrome
time factors exercise viruses sars infectious disease transmission, vertical
prognosis stress infectious diseases seroepidemiologic studies republic of korea

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: