inclusion criteria: * inpatients diagnosed with covid-19 by rt-pcr; * time between symptom onset and inclusion ≤ 10 days; * age ≥ 18 years and \<75 years * no indication of invasive ventilatory support at the time of randomization; * signature of the informed consent form.

inclusion criteria: * inpatients diagnosed with covid-19 by rt-pcr; * time between symptom onset and inclusion ≤ 10 days; * age ≥ 18 years and \<75 years * no indication of invasive ventilatory support at the time of randomization; * signature of the informed consent form.

inclusion criteria: - inpatients diagnosed with covid-19 by rt-pcr; - time between symptom onset and inclusion ≤ 10 days; - age ≥ 18 years and <75 years - no indication of invasive ventilatory support at the time of randomization; - signature of the informed consent form.

inclusion criteria: - inpatients diagnosed with covid-19 by rt-pcr; - time between symptom onset and inclusion ≤ 10 days; - age ≥ 18 years and <75 years - no indication of invasive ventilatory support at the time of randomization; - signature of the informed consent form.