This platform trial will provide access to repurposed and investigational agents for critically ill patients infected with SARS-CoV-2 who have severe or life-threatening COVID-19.

Any critically ill patient with known or presumed COVID-19 will be automatically entered into the screening phase of the trial until SARS-CoV-2 infection is confirmed. Basic data will be assembled for each patient (such as ventilatory status and survival). All patients who start high-flow oxygen (WHO COVID-19 level 5; > 6L oxygen by nasal prongs or mask) will be entered in an observational registry which will only require extraction of medical record data.

Registry participants will be asked to sign a consent form for the backbone treatment and a specific investigational agent arm to which they are assigned. The primary endpoint will be time to recover to a durable level 4 (or less) on the WHO COVID-19 ordinal scale for clinical improvement.

For this trial, a durable level 4 is defined as at least 48 hours at COVID level 4 or less (nasal prongs oxygen) without returning to high flow oxygen or intubation. Acute care facility resource utilization will be automatically calculated (total length of stay in a critical care setting, days intubated, and survival).

Any change in status, including intubation, extubation, death or discharge, will be recorded and verified by the attending physician.