inclusion criteria: - informed consent must be obtained from the subject or health care proxy before any assessment is performed. - adults (male and female) aged 65 years and over. - residing in a nursing home in which one or more residents or staff has developed laboratory-confirmed symptomatic covid-19 infection at the time of randomization

inclusion criteria: - informed consent must be obtained from the subject or health care proxy before any assessment is performed. - adults (male and female) aged 65 years and over. - residing in a nursing home in which one or more residents or staff has developed laboratory-confirmed symptomatic covid-19 infection at the time of randomization