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Solid organ transplant recipients (SOTr) remain at risk of severe COVID-19. Several previous early therapies are no longer effective against new circulating variants. We performed a prospective cohort study in outpatient adult SOTr during the omicron BA.2 wave (April–May 2022), to determine the effectiveness of 3 doses of remdesivir given within 7 days of symptoms onset. Patients were followed for at least 30 days. The primary outcome was hospitalization. Of 210 SOTr that had COVID-19, we included 192. The median age was 54.5 years and 61.5% were men. The most common transplants were kidney (41.7%), lung (19.3%), liver (18.8%), and heart (6.3%). Most patients (90.1%) had previously received !3 COVID-19 vaccine doses. Fifteen (7.8%) were hospitalized, 5(2.6%) required supplemental oxygen, 3(1.6%) ICU admission, and 2(1%) mechanical ventilation with 2(1%) deaths. Age, the number of comorbidities, prednisone chronic treatment, and lung transplant were risk factors for hospitalization. Early remdesivir significantly decreased the hospitalization rate: adjusted hazard ratio 0.12 (95% CI: 0.03–0.57). The adjusted number needed to treat to prevent one hospitalization was 15.2 (95% CI: 13.6–31.4). No patient that received early remdesivir needed ICU admission or died. In a cohort of SOTr with COVID-19 infection, administration of 3-dose early remdesivir independently reduced the disease severity.