inclusion criteria: * confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 with sample collection ≤ 10 days prior to randomization * covid-19 illness of any duration of symptoms * hospitalized for covid-19 for ≤ 5 days with mild to moderate covid-19 symptoms and meets criteria for either category 4, category 5, or category 6 per 8-point ordinal scale * adequate organ function * participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration

inclusion criteria: * confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 with sample collection ≤ 10 days prior to randomization * covid-19 illness of any duration of symptoms * hospitalized for covid-19 for ≤ 5 days with mild to moderate covid-19 symptoms and meets criteria for either category 4, category 5, or category 6 per 8-point ordinal scale * adequate organ function * participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration

inclusion criteria: - confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 with sample collection ≤ 10 days prior to randomization - covid-19 illness of any duration of symptoms - hospitalized for covid-19 for ≤ 5 days with mild to moderate covid-19 symptoms and meets criteria for either category 4, category 5, or category 6 per 8-point ordinal scale - adequate organ function - participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration

inclusion criteria: - confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 with sample collection ≤ 10 days prior to randomization - covid-19 illness of any duration of symptoms - hospitalized for covid-19 for ≤ 5 days with mild to moderate covid-19 symptoms and meets criteria for either category 4, category 5, or category 6 per 8-point ordinal scale - adequate organ function - participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration

inclusion criteria: - confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 within 72 hours before randomization - onset of symptoms not more than 7 days prior to randomization - hospitalized for covid-19 for ≤72 hours with mild to moderate covid-19 symptoms - maintains o2 saturation of ≥93% on room air or supplemental o2, including high-flow and non-invasive ventilation, at randomization - adequate organ function - participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration

inclusion criteria: - confirmed positive by polymerase chain reaction (pcr) or antigen test for sars-cov-2 within 72 hours before randomization - onset of symptoms not more than 7 days prior to randomization - hospitalized for covid-19 for ≤72 hours with mild to moderate covid-19 symptoms - maintains o2 saturation of ≥93% on room air or supplemental o2, including high-flow and non-invasive ventilation, at randomization - adequate organ function - participants of child-bearing age must agree to use adequate contraception for 6 weeks after study treatment administration