inclusion criteria: * patient with covid 19 pneumonia assessed by pcr and ct scann. * patient admited in a dedicated medical ward * patient with oxygen supply less or equal to 4 liters per minute. * written informed consent

inclusion criteria: * patient with covid 19 pneumonia assessed by pcr and ct scann. * patient admited in a dedicated medical ward * patient with oxygen supply less or equal to 4 liters per minute. * written informed consent

inclusion criteria: - patient with covid 19 pneumonia assessed by pcr and ct scann. - patient admited in a dedicated medical ward - patient with oxygen supply less or equal to 4 liters per minute. - written informed consent

inclusion criteria: - patient with covid 19 pneumonia assessed by pcr and ct scann. - patient admited in a dedicated medical ward - patient with oxygen supply less or equal to 4 liters per minute. - written informed consent