18-75 year old men and 50-75 year old women admitted in hospital Percentage of oxygen saturation at the time of admission: 89-85% (provided it is modified with Nazal auxiliary oxygen to more or equal to 90%) or oxygen saturation percentage of 90-93% and the number of breaths per minute more or equal to 30 Clinical manifestations associated with COVID-19 pneumonia with positive PCR test or HR-CT scan

18-75 year old men and 50-75 year old women admitted in hospital Percentage of oxygen saturation at the time of admission: 89-85% (provided it is modified with Nazal auxiliary oxygen to more or equal to 90%) or oxygen saturation percentage of 90-93% and the number of breaths per minute more or equal to 30 Clinical manifestations associated with COVID-19 pneumonia with positive PCR test or HR-CT scan