COVID-19(375) SARS-CoV-2(264) coronavirus(204) acute respiratory syndrome(198) Patient(169) coronavirus disease(157) Vaccine(148) vaccination(146) Infection(134) variant(104) Trial(103) antibody(97) individual(94) Coronavirus disease 2019(88) 95% confidence interval(88) dose(88) Efficacy(87) Treatment(84) reduced(81) SARS-COV-2 infection(78) disease(77) Hospitalization(77) death(75) Analysis(69) Evidence(69) identify(69) COVID-19 vaccine(69) BNT162b2(69) neutralizing antibody(68) acute respiratory syndrome coronavirus(65)