Pharmacokinetics, Pharmacodynamics, and Safety of Single-dose Sotrovimab in High-risk Pediatric Participants With Mild to Moderate COVID-19

Inclusion criteria: * Participant must be 32 weeks estimated gestational age (EGA), day of life (DOL) 0 to \<18 years of age inclusive, at either the time of participant's signed assent (if age-appropriate) or parent(s)/legally authorized representative signing the informed consent. * Participants with mild-moderate COVID-19. * Participants at risk of disease progression with at least one of the following criteria: Age \<1 year; Diabetes mellitus; Genetic or metabolic diseases; Obesity ); Cardiovascular disease; Sickle cell disease; Pulmonary disease; Neurologic disease; Immunosuppressed ; Baseline medical complexity (gastrostomy- or jejunostomy-dependence, parenteral nutrition dependence, tracheostomy-dependence, Baseline oxygen requirement, use of Continuous positive airway pressure \[CPAP\]/ Bilevel positive airway pressure \[BiPAP\]/ventilator support). Exclusion Criteria * Participant is pregnant or breastfeeding. * Participant is currently hospitalized, or judged by the investigator as likely to require hospitalization in the next 24 hours, due to severe or critical COVID-19. * Multisystem inflammatory syndrome in children (MIS-C). * Prior, current, or planned future use of any of the following treatments during the study period: COVID-19 convalescent plasma, Monoclonal antibodies (mAbs) against Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) (for example \[e.g.\], casirivimab/imdevimab), intravenous immunoglobulin (IVIG) for any indication, or dexamethasone specifically for treatment of COVID-19. * Current use of COVID-19 treatment (authorized, approved, or investigational). * The following exclusions related to use of an authorized or approved vaccine for SARS-CoV-2 are applicable: 1. Receipt of any authorized or approved vaccine for SARS-CoV-2 within 48 hours prior to dosing. 2. Planned use of any authorized or approved vaccine for SARS-CoV-2 within 90 days of study drug administration per current Centers for Disease Control and Prevention (CDC) recommendations. * Receipt of any non-SARS-CoV-2 vaccines within 14 days (for non-live vaccines) or 28 days (for live vaccine) of screening. * Currently enrolled in another clinical study. * Infants \<24 weeks of age: maternal receipt of IVIG, SARS-CoV-2-directed convalescent plasma or SARS-CoV-2-directed mAb(s) within 3 months prior to birth or within 5 half-lives of the investigational product (whichever is longer).