1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household active respiratory or non-respiratory symptoms consistent with covid-19 history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening nursing home resident any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household active respiratory or non-respiratory symptoms consistent with covid-19 history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening nursing home resident any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection or currently lives with individuals who have sars-cov-2 infection, with the exception of the index case(s), the first individual(s) known to be infected in the household 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator, within the prior 6 months to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator within the prior month to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply

1. history of prior positive sars-cov-2 rt-pcr test or positive sars-cov-2 serology test at any time before the screening 2. participant has lived with individuals who have had previous sars-cov-2 infection 3. active respiratory or non-respiratory symptoms consistent with covid-19 4. history of respiratory illness with sign/symptoms of sars-cov-2 infection, in the opinion of the investigator within the prior month to screening 5. nursing home resident 6. any physical examination findings, and/or history of any illness, concomitant medications or recent live vaccines that, in the opinion of the study investigator, might confound the results of the study or pose an additional risk to the participant by their participation in the study note: other protocol-defined inclusion/ exclusion criteria apply