inclusion criteria: * positive nasopharyngeal swab for covid-19, asymptomatic or paucisymptomatic, aged ≥70 years and/or with clinical risk factors for poor outcome (clinically relevant chronic lung disease, diabetes and/or heart disease) or * symptomatic with respiratory or systemic symptoms, however clinically stable (mews\<3) with ct imaging showing viral pneumonia and positive or pending pharyngo-nasal swab for covid-19: temperature 38°c and/or intensive cough, respiratory rate \< 25 /min, oxygen saturation (pulse oximetry) \>95% * positive swab for covid-19 * with respiratory and/or systemic symptoms and initial mild respiratory failure e with objective signs of lung involvement; the patient is in stable conditions (mews \< 3) temperature\>38°c and or intensive cough, respiratory rate ≥25 /min, or oxygen saturation 94- 95% in room air

inclusion criteria: * positive nasopharyngeal swab for covid-19, asymptomatic or paucisymptomatic, aged ≥70 years and/or with clinical risk factors for poor outcome (clinically relevant chronic lung disease, diabetes and/or heart disease) or * symptomatic with respiratory or systemic symptoms, however clinically stable (mews\<3) with ct imaging showing viral pneumonia and positive or pending pharyngo-nasal swab for covid-19: temperature 38°c and/or intensive cough, respiratory rate \< 25 /min, oxygen saturation (pulse oximetry) \>95% * positive swab for covid-19 * with respiratory and/or systemic symptoms and initial mild respiratory failure e with objective signs of lung involvement; the patient is in stable conditions (mews \< 3) temperature\>38°c and or intensive cough, respiratory rate ≥25 /min, or oxygen saturation 94- 95% in room air

inclusion criteria: - positive nasopharyngeal swab for covid-19, asymptomatic or paucisymptomatic, aged ≥70 years and/or with clinical risk factors for poor outcome (clinically relevant chronic lung disease, diabetes and/or heart disease) or - symptomatic with respiratory or systemic symptoms, however clinically stable (mews<3) with ct imaging showing viral pneumonia and positive or pending pharyngo-nasal swab for covid-19: temperature 38°c and/or intensive cough, respiratory rate < 25 /min, oxygen saturation (pulse oximetry) >95% - positive swab for covid-19 - with respiratory and/or systemic symptoms and initial mild respiratory failure e with objective signs of lung involvement; the patient is in stable conditions (mews < 3) temperature>38°c and or intensive cough, respiratory rate ≥25 /min, or oxygen saturation 94- 95% in room air

inclusion criteria: - positive nasopharyngeal swab for covid-19, asymptomatic or paucisymptomatic, aged ≥70 years and/or with clinical risk factors for poor outcome (clinically relevant chronic lung disease, diabetes and/or heart disease) or - symptomatic with respiratory or systemic symptoms, however clinically stable (mews<3) with ct imaging showing viral pneumonia and positive or pending pharyngo-nasal swab for covid-19: temperature 38°c and/or intensive cough, respiratory rate < 25 /min, oxygen saturation (pulse oximetry) >95% - positive swab for covid-19 - with respiratory and/or systemic symptoms and initial mild respiratory failure e with objective signs of lung involvement; the patient is in stable conditions (mews < 3) temperature>38°c and or intensive cough, respiratory rate ≥25 /min, or oxygen saturation 94- 95% in room air