Confirmed or suspected COVID-19 pneumonia based on PCR or pulmonary imaging; Presenting clinical symptoms of COVID-19 (fever, cough, dyspnea); O2 saturation equal or less than 93%; Age equal or more than 18 years old; The patient has informed and free written consent to participate in the study; Less than 7 days passed from the onset of clinical symptoms to the time of enrollment; The patient should not attend another clinical trial at the same time.

Confirmed or suspected COVID-19 pneumonia based on PCR or pulmonary imaging; Presenting clinical symptoms of COVID-19 (fever, cough, dyspnea); O2 saturation equal or less than 93%; Age equal or more than 18 years old; The patient has informed and free written consent to participate in the study; Less than 7 days passed from the onset of clinical symptoms to the time of enrollment; The patient should not attend another clinical trial at the same time.