SARS-CoV-2(140) variant(87) Infection(60) COVID-19(55) Vaccine(52) individual(50) SARS-CoV-2 variant(47) variants(47) coronavirus(46) omicron(44) antibody(38) Spread(38) Beta(38) acute respiratory syndrome(37) Mutation(37) SARS-CoV-2 variants(36) Delta(35) virus(32) VoC(32) neutralization(32) the SARS-CoV-2(32) SARS-COV-2 infection(30) Lineage(30) Spike protein(29) B.1.1.7(27) Surveillance(27) circulating(27) viral infection(27) neutralizing antibody(26) Analysis(26)