Confirmed diagnosis of COVID-19, with either lung CT-Scan result, which is typical for COVID-19 pulmonary involvement,or RT-PCR confirmation. The patient/Legal guardian has written consciously and freely consent to participate in the study; In the first 48 hours after his/her inclusion into this study, there is no possibility of discharge from the patient's hospital; Moderate to severe COVID pneumonia

Confirmed diagnosis of COVID-19, with either lung CT-Scan result, which is typical for COVID-19 pulmonary involvement,or RT-PCR confirmation. The patient/Legal guardian has written consciously and freely consent to participate in the study; In the first 48 hours after his/her inclusion into this study, there is no possibility of discharge from the patient's hospital; Moderate to severe COVID pneumonia