SARS-CoV-2(238) COVID-19(213) Analysis(99) pandemic(84) coronavirus(84) Mutation(81) variant(76) SARS-CoV-2.(67) virus(64) Patient(55) Infection(53) Genome(53) variants(51) sequence(50) country(50) Protein(49) association(47) analyzed(46) Spread(46) acute respiratory syndrome(45) the SARS-CoV-2(45) acute respiratory syndrome coronavirus(43) Frequency(41) Lineage(41) severe acute respiratory syndrome Coronavirus(40) Genotype(39) coronavirus disease(38) genomic(38) severity(36) clade(36)