inclusion criteria: * diagnosis of flu syndrome with hospitalization criteria; * respiratory rate ≥ 24irpm and / or saturation \<93% in room air, or belonging to the risk group for complications: 1. chronic diseases: heart disease, diabetes mellitus, systemic arterial hypertension and neoplasms, 2. immunosuppression, 3. pulmonary tuberculosis; 4. obesity; * tomographic findings compatible with coronavirus disease.

inclusion criteria: * diagnosis of flu syndrome with hospitalization criteria; * respiratory rate ≥ 24irpm and / or saturation \<93% in room air, or belonging to the risk group for complications: 1. chronic diseases: heart disease, diabetes mellitus, systemic arterial hypertension and neoplasms, 2. immunosuppression, 3. pulmonary tuberculosis; 4. obesity; * tomographic findings compatible with coronavirus disease.

inclusion criteria: - diagnosis of flu syndrome with hospitalization criteria; - respiratory rate ≥ 24irpm and / or saturation <93% in room air, or belonging to the risk group for complications: 1. chronic diseases: heart disease, diabetes mellitus, systemic arterial hypertension and neoplasms, 2. immunosuppression, 3. pulmonary tuberculosis; 4. obesity; - tomographic findings compatible with coronavirus disease.

inclusion criteria: - diagnosis of flu syndrome with hospitalization criteria; - respiratory rate ≥ 24irpm and / or saturation <93% in room air, or belonging to the risk group for complications: 1. chronic diseases: heart disease, diabetes mellitus, systemic arterial hypertension and neoplasms, 2. immunosuppression, 3. pulmonary tuberculosis; 4. obesity; - tomographic findings compatible with coronavirus disease.