In this post, we present the current focus of the COVID-19 literature, based on publications registered in PubMed as published from March 6th to April 3rd, 2022.

The analysis is based on  8526 publications, which gave 1059 keywords that appear in 5 or more manuscripts, divided into 7 clusters.

To open the map directly in VOSviewer, please use the Keyword co-occurrence MAP and NET files from April 2022, available through the Open Science Foundation (OSF) repository:

In the table below, we have listed the 20 most central keywords in each cluster.

Cluster 1 Cluster 2 Cluster 3  Clutster 4 Cluster 5 Cluster 6  Cluster 7
adolescent hospitalization animals public health covid-19 vaccines rna, viral pregnancy
children risk factor spike glycoprotein, coronavirus telemedicine vaccination covid-19 testing infant
mental health mortality antibodies, viral epidemiology vaccine machine learning breastfeeding
anxiety inflammation antibodies, neutralizing social media bnt162 vaccine deep learning pregnancy complications, infectious
communicable disease control aged, 80 and over mice infectious diseases vaccines, synthetic artificial intelligence infectious disease transmission, vertical
depression cytokines ace2 delivery of health care vaccine hesitancy diagnosis milk, human
stress incidence antibody ethnicity mrna vaccines ct magnetic resonance imaging
health personnel infection immunity policy viral vaccines world health organization women
students biomarkers antiviral agents health policy influenza, human algorithms brain
attitude intensive care units lung communication rna, messenger nucleic acid amplification techniques tertiary care centers
disease outbreaks obesity immunoglobulin g epidemic neoplasms real time polymerase chain reaction mothers
lockdown vitamin d viruses infection control vaccination hesitancy saliva placenta
quality of life severity of illness index molecular docking simulation patient acceptance of health care cancer bayes theorem cesarean section
exercise pneumonia mutation technology time factors screening guidelines
quarantine hospitals antibodies, monoclonal ethics hiv molecular diagnostic techniques lactation
prevalence age factors omicron social determinants of health hiv infections nasopharynx smell
physical activity critical care seroepidemiologic studies ontario chadox1 ncov-19 smartphone blood pressure
health knowledge, attitudes, practice treatment outcome neutralization tests primary care vaccine efficacy reverse transcription polymerase chain reaction postpartum
universities respiration, artificial protein binding trust myocarditis biosensing techniques obstetrics
health care comorbidity viral load contact tracing influenza vaccines point-of-care systems asymptomatic infections