SARS-CoV-2(188) COVID-19(129) Antiviral(121) coronavirus(86) Treatment(67) antiviral activity(66) in vitro(62) SARS-CoV-2 variant(61) variant(58) virus(57) Hepatitis B virus(55) SARS-COV-2 infection(54) Remdesivir(50) SARS-CoV-2.(48) Infection(47) SARS-CoV-2 variants(45) inhibitor(44) Protein(43) Vaccine(42) omicron(42) variants(42) Cell(40) acute respiratory syndrome(40) caused(35) demonstrated(35) Alpha(35) Replication(34) effective(33) antivirals(33) Influenza(33)