Patients 18 to 75 years old hospitalized Patient with SpO2:85-89% on room air at admission (if correct with nasal O2 maximum 6 liter/min to SpO2>=90 ) Patients with SpO2: 90-93% and RR>=30 clinical compatible patients with positive RT-PCR test or consistent HRCT to covid19 pneumonia Sign the study participation form

Patients 18 to 75 years old hospitalized Patient with SpO2:85-89% on room air at admission (if correct with nasal O2 maximum 6 liter/min to SpO2>=90 ) Patients with SpO2: 90-93% and RR>=30 clinical compatible patients with positive RT-PCR test or consistent HRCT to covid19 pneumonia Sign the study participation form