* Intubated, or expected to be intubated in the next 12 hours * Non Intubated patients with severe disease where the treating intensivist (or an intensivist who is not a study investigator) has any safety concerns regarding the use of prone positioning *Previously intubated for COVID-19, or in the recovery phase of their illness. *Current (or expected) treatment limits such as ‘not for CPR’ or end-of-life care orders *If in the judgment of the treating clinical team there is any other medical condition present which may reduce the safety of the prone positioning. Examples would include pregnancy, concurrent spinal precautions, severe cervical spine arthritis.

* Intubated, or expected to be intubated in the next 12 hours * Non Intubated patients with severe disease where the treating intensivist (or an intensivist who is not a study investigator) has any safety concerns regarding the use of prone positioning *Previously intubated for COVID-19, or in the recovery phase of their illness. *Current (or expected) treatment limits such as ‘not for CPR’ or end-of-life care orders *If in the judgment of the treating clinical team there is any other medical condition present which may reduce the safety of the prone positioning. Examples would include pregnancy, concurrent spinal precautions, severe cervical spine arthritis.