SARS-CoV-2(481) COVID-19(392) coronavirus(379) acute respiratory syndrome(304) Infection(260) virus(161) SARS-COV-2 infection(158) pandemic(154) Vaccine(149) coronavirus disease(146) variant(131) antibody(127) respiratory(127) Protein(127) Mutation(120) Cell(110) Spike protein(110) acute respiratory syndrome coronavirus(108) disease(104) Host(101) spike(100) Viral(96) the SARS-CoV-2(95) caused(95) Evidence(91) variants(90) severe acute respiratory syndrome Coronavirus(90) Patient(88) acute respiratory syndrome coronavirus 2(85) Critical(84)