Severe acute respiratory syndrome coronavirus 2 157 human 154 COVID-19 144 SARS-CoV-2 143 Humans 129 Article 119 coronavirus disease 2019 118 nonhuman 89 controlled study 59 pandemic 49 genetics 38 virology 38 adult 37 female 37 procedures 35 male 33 Pandemics 32 epidemiology 27 major clinical study 25 chemistry 23 middle aged 23 metabolism 22 disease severity 21 unclassified drug 21 Female 20 immunology 20 vaccination 20 aged 19 antivirus agent 18 diagnosis 18