inclusion criteria: age phase 1: ≥ 18 years to ≤ 55 years phase 2: ≥ 18 years to ≤ 65 years are male or non-pregnant females who agree to contraceptive requirements. patients with rt-pcr confirmed covid-19 in ≤ 72 hours prior to randomization [ct ≥ 24]. have spo2<94% (range 90-93%) on room air. have one or more of the following- dyspnea, fever, cough, respiratory rate ≥ 24 per minute and heart rate up to 120 per minute. patients who agree to participate in the study and follow all study related procedures

inclusion criteria: age phase 1: ≥ 18 years to ≤ 55 years phase 2: ≥ 18 years to ≤ 65 years are male or non-pregnant females who agree to contraceptive requirements. patients with rt-pcr confirmed covid-19 in ≤ 72 hours prior to randomization [ct ≥ 24]. have spo2<94% (range 90-93%) on room air. have one or more of the following- dyspnea, fever, cough, respiratory rate ≥ 24 per minute and heart rate up to 120 per minute. patients who agree to participate in the study and follow all study related procedures

inclusion criteria: 1. age phase 1: ≥ 18 years to ≤ 55 years phase 2: ≥ 18 years to ≤ 65 years 2. are male or non-pregnant females who agree to contraceptive requirements. 3. patients with rt-pcr confirmed covid-19 in ≤ 72 hours prior to randomization [ct ≥ 24]. 4. have spo2<94% (range 90-93%) on room air. 5. have one or more of the following- dyspnea, fever, cough, respiratory rate ≥ 24 per minute and heart rate up to 120 per minute. 6. patients who agree to participate in the study and follow all study related procedures

inclusion criteria: 1. age phase 1: ≥ 18 years to ≤ 55 years phase 2: ≥ 18 years to ≤ 65 years 2. are male or non-pregnant females who agree to contraceptive requirements. 3. patients with rt-pcr confirmed covid-19 in ≤ 72 hours prior to randomization [ct ≥ 24]. 4. have spo2<94% (range 90-93%) on room air. 5. have one or more of the following- dyspnea, fever, cough, respiratory rate ≥ 24 per minute and heart rate up to 120 per minute. 6. patients who agree to participate in the study and follow all study related procedures