Why oxygen? Cant they treat with something else ? When the virus hits the lungs i think the patients have less chance to survive. But, may be some mwdocine via nebulize could be a solution and first stage of suspect infected person could try inhale steam with citric family plant leafs in hot boiled water through nose...
They believed to be a good ayrvedic herbal history since anciet times, they seem lack of trust and knowledfe on those these days.