inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: * sars-cov-2 positive rt-pcr or antigen test * typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration \<= 9 days 3. spo2 \<= 94% in room air or need for supplemental oxygen to maintain spo2\> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: * sars-cov-2 positive rt-pcr or antigen test * typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration \<= 9 days 3. spo2 \<= 94% in room air or need for supplemental oxygen to maintain spo2\> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: adults (≥ 18 years) hospitalized with covid-19: sars-cov-2 positive rt-pcr or antigen test typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 symptom duration <= 9 days spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: adults (≥ 18 years) hospitalized with covid-19: sars-cov-2 positive rt-pcr or antigen test typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 symptom duration <= 9 days spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or antigen test - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 9 days 3. spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or antigen test - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 9 days 3. spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 7 days 3. spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 7 days 3. spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 7 days 3. at least 1 of the following prognostic factors: - spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% - lymphocyte count <800/microl 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples

inclusion criteria: 1. adults (≥ 18 years) hospitalized with covid-19: - sars-cov-2 positive rt-pcr or - typical clinical history and chest ct with typical findings, pending rt-pcr for sars-cov-2 2. symptom duration <= 7 days 3. at least 1 of the following prognostic factors: - spo2 <= 94% in room air or need for supplemental oxygen to maintain spo2> 94% - lymphocyte count <800/microl 4. the patient consents to participate in the study and is willing to comply with all study procedures, including the collection of virology samples