SARS-CoV-2(3115) COVID-19(2382) coronavirus(1304) Infection(1210) virus(1090) acute respiratory syndrome(885) pandemic(743) variant(733) respiratory(731) SARS-COV-2 infection(710) Patient(662) Vaccine(639) Viral(586) antibody(584) the SARS-CoV-2(570) Analysis(539) caused(501) vaccination(495) acute respiratory syndrome coronavirus(485) severe acute respiratory syndrome Coronavirus(475) variants(469) Mutation(468) COVID-19 pandemic(467) Spread(460) disease(447) tested(438) Protein(434) Treatment(431) reported(429) positive(428)