Inclusion Criteria:  Is ≥ 18 years of age. Tested positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by RT-PCR and/or antigen test. Had an onset of COVID-19 symptom(s) within 8 days prior to screening; except for dyspnoea and/or tachypnoea for which an onset within 2 days prior to screening is applicable. Requires hospitalisation for medical care. Has oxygen saturation >= 91%.  Exclusion Criteria:  Requires non-invasive or invasive mechanical ventilation and/or intensive care. Symptoms consistent with severe COVID-19. Has received a monoclonal antibody, plasma from a person who recovered from COVID-19 or any investigational treatment for COVID-19 within 30 days prior to study treatment. Has received an investigational or approved vaccination against SARS-CoV-2 within 14 days prior to study treatment.  NOTE: Other protocol defined inclusion/exclusion criteria apply