Wave(1) Result(1) Risk factors(1) conducted(1) risk(1) Characteristics(1) death(1) General population(1) confirmed case(1) coronavirus(1) country(1) caused(1) COVID-19 pandemic(1) Significant(1) Screening(1) outbreak(1) Public health interventions(1) chi-square test(1) significant difference(1) lack(1) Immunity(1) determine(1) Infectious disease(1) COVID-19 vaccination(1) Community(1) disease(1) retrospective cohort study(1) pandemic(1) spread of COVID-19(1) reported(1)