inclusion criteria: * household contact of index case: currently residing in the same household as an individual evaluated at nyp via outpatient, emergency department (ed), or inpatient services who (1) test positive for covid-19, or (2) are defined as suspected cases, or persons under investigations (pui), by the treating physician. * willing to take study drug as directed for 5 days.

inclusion criteria: * household contact of index case: currently residing in the same household as an individual evaluated at nyp via outpatient, emergency department (ed), or inpatient services who (1) test positive for covid-19, or (2) are defined as suspected cases, or persons under investigations (pui), by the treating physician. * willing to take study drug as directed for 5 days.

inclusion criteria: - household contact of index case: currently residing in the same household as an individual evaluated at nyp via outpatient, emergency department (ed), or inpatient services who (1) test positive for covid-19, or (2) are defined as suspected cases, or persons under investigations (pui), by the treating physician. - willing to take study drug as directed for 5 days.

inclusion criteria: - household contact of index case: currently residing in the same household as an individual evaluated at nyp via outpatient, emergency department (ed), or inpatient services who (1) test positive for covid-19, or (2) are defined as suspected cases, or persons under investigations (pui), by the treating physician. - willing to take study drug as directed for 5 days.