SARS-CoV-2(24) COVID-19(20) Chinese(15) English(15) coronavirus(13) SARS-CoV-2.(10) mice(9) variant(9) Spike protein(8) demonstrated(8) caused(8) viral replication(8) animal model(8) susceptibility(7) acute respiratory syndrome(7) Treatment(7) Coronavirus disease 2019(7) severe acute respiratory syndrome Coronavirus(7) acute respiratory syndrome coronavirus(7) coronavirus disease(7) SARS-COV-2 infection(6) ACE2(6) pangolin(6) SARS-CoV-2 spike protein(6) Genetic(5) enzyme(5) Combination(5) the SARS-CoV-2(5) acute respiratory syndrome coronavirus 2(5) SARS-CoV-2 replication(5)