Feeding COVID-19 infected patients with oxygen has not yet been successful. It's like feeding fire with oxygen! The virus feels good in an oxygen enriched environment and becomes more powerful! Applying moderate hypoxia at an early stage of the infection will block the spread of the infection through the bloodstream.
This can be controlled relatively easily by exposing patients to 10 to 12% O2 and achieving oxygen saturation between 75% to 80%, alternating with short recovery periods in the ambient air. This so-called intermittent hypoxic training has been used by Altitude Dream especially for acclimatization of mountain athletes.
Researchers are recommended to take a serious look at this application.