inclusion criteria: * informed consent from patient or legal representative. * subject of both genders (male and female not pregnant and not breastfeeding) aged over 49; * laboratory confirmation of 2019-ncov infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source; * symptomatic subject with symptoms for up to 72 hours who does not require hospitalization, with signs and symptoms of acute respiratory viral infection characterized by a feverish sensation or fever, which may or may not be present at the time of the examination (which may be reported to the health professional), accompanied by cough or sore throat or runny nose or difficulty breathing and: i) oxygen saturation ≥ 90%; ii) risk classification for covid-19 between low (a) or medium (b) (scores 1 to 19), according to the brazilian ministry of health.

inclusion criteria: * informed consent from patient or legal representative. * subject of both genders (male and female not pregnant and not breastfeeding) aged over 49; * laboratory confirmation of 2019-ncov infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source; * symptomatic subject with symptoms for up to 72 hours who does not require hospitalization, with signs and symptoms of acute respiratory viral infection characterized by a feverish sensation or fever, which may or may not be present at the time of the examination (which may be reported to the health professional), accompanied by cough or sore throat or runny nose or difficulty breathing and: i) oxygen saturation ≥ 90%; ii) risk classification for covid-19 between low (a) or medium (b) (scores 1 to 19), according to the brazilian ministry of health.

inclusion criteria: - informed consent from patient or legal representative. - subject of both genders (male and female not pregnant and not breastfeeding) aged over 49; - laboratory confirmation of 2019-ncov infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source; - symptomatic subject with symptoms for up to 72 hours who does not require hospitalization, with signs and symptoms of acute respiratory viral infection characterized by a feverish sensation or fever, which may or may not be present at the time of the examination (which may be reported to the health professional), accompanied by cough or sore throat or runny nose or difficulty breathing and: i) oxygen saturation ≥ 90%; ii) risk classification for covid-19 between low (a) or medium (b) (scores 1 to 19), according to the brazilian ministry of health.

inclusion criteria: - informed consent from patient or legal representative. - subject of both genders (male and female not pregnant and not breastfeeding) aged over 49; - laboratory confirmation of 2019-ncov infection by reverse-transcription polymerase chain reaction (rt-pcr) from any diagnostic sampling source; - symptomatic subject with symptoms for up to 72 hours who does not require hospitalization, with signs and symptoms of acute respiratory viral infection characterized by a feverish sensation or fever, which may or may not be present at the time of the examination (which may be reported to the health professional), accompanied by cough or sore throat or runny nose or difficulty breathing and: i) oxygen saturation ≥ 90%; ii) risk classification for covid-19 between low (a) or medium (b) (scores 1 to 19), according to the brazilian ministry of health.