Medium to critical grade Covid-19 without intubation with respiratory symptoms Positive PCR test Need to receive more than 4 to 6 liters of oxygen per minute with a simple mask with non-rebreathing storage bag Apache score less than 25 18 to 75 years Absence of acute asthma, and other lung diseases such as pulmonary edema, heart and lung disease

Medium to critical grade Covid-19 without intubation with respiratory symptoms Positive PCR test Need to receive more than 4 to 6 liters of oxygen per minute with a simple mask with non-rebreathing storage bag Apache score less than 25 18 to 75 years Absence of acute asthma, and other lung diseases such as pulmonary edema, heart and lung disease