Time to clinical improvement (TTCI); which refers to the time from randomization to an improvement of two points on the seven-category ordinal scale stated below or live discharge from the hospital: 1. not hospitalized with a resumption of normal activities; 2. not hospitalized; but unable to resume normal activities; 3. hospitalized; not requiring supplemental oxygen; 4. hospitalized; requiring supplemental oxygen; 5. hospitalized; requiring nasal high-flow oxygen therapy or non-invasive mechanical ventilation; 6. hospitalized; requiring ECMO; invasive mechanical ventilation; or both; and 7. death.The time for clinical improvement or even hospital discharge will be measured in days.

Time to clinical improvement (TTCI); which refers to the time from randomization to an improvement of two points on the seven-category ordinal scale stated below or live discharge from the hospital: 1. not hospitalized with a resumption of normal activities; 2. not hospitalized; but unable to resume normal activities; 3. hospitalized; not requiring supplemental oxygen; 4. hospitalized; requiring supplemental oxygen; 5. hospitalized; requiring nasal high-flow oxygen therapy or non-invasive mechanical ventilation; 6. hospitalized; requiring ECMO; invasive mechanical ventilation; or both; and 7. death.The time for clinical improvement or even hospital discharge will be measured in days.