COVID-19(101) setting(51) SARS-CoV-2(51) Care(36) home(32) Nursing(32) Long-term care(31) nursing homes(29) nursing home(28) Mortality(22) resident(21) Patient(20) pandemic(20) Infection(19) risk(19) conducted(19) Older(19) vaccination(18) antibody(17) Vaccine(16) facility(16) participant(16) Health(15) death(15) 95% CI(15) reported(14) Evidence(14) positive(14) outbreak(14) cohort study(13)