At least secondary outcome measures have interval times less than 14 days

Secondary Outcome Measures:
2. Time to clinical resolution (TTCR)
Day 14
3. Change from baseline in National Early Warning Score 2 (NEWS2)
This score is based on 7 clinical parameters (respiration rate, oxygen saturation, any supplemental oxygen, temperature, systolic blood pressure, heart rate, level of consciousness). Higher scores mean a worse outcome.

[Time Frame: Days 3, 7, and 14]
4. Change from baseline in pulse oxygen saturation (SpO2)
Days 3, 7, and 14
5. Change from baseline in the patient's health status on a 7-category ordinal scale
A 7-category ordinal scale of patient health status ranges from: 1) Death; 2) Hospitalized, on invasive mechanical ventilation or extracorporeal membrane oxygenation (ECMO); 3) Hospitalized, on non-invasive ventilation or high flow oxygen devices; 4) Hospitalized, requiring supplemental oxygen; 5) Hospitalized, not requiring supplemental oxygen; 6) Not hospitalized, limitation on activities; 7) Not hospitalized, no limitations on activities.

Lower scores mean a worse outcome.