inclusion criteria: * severe acute respiratory syndrome coronavirus2 (sars-cov-2) infection * within 7 days from the onset of clinical symptoms or 4 days from the onset of severe symptoms * consistent with the national health committee new coronavirus pneumonia diagnosis and treatment plan (eighth edition), general or heavy diagnostic criteria.

inclusion criteria: * severe acute respiratory syndrome coronavirus2 (sars-cov-2) infection * within 7 days from the onset of clinical symptoms or 4 days from the onset of severe symptoms * consistent with the national health committee new coronavirus pneumonia diagnosis and treatment plan (eighth edition), general or heavy diagnostic criteria.

inclusion criteria: - severe acute respiratory syndrome coronavirus2 (sars-cov-2) infection - within 7 days from the onset of clinical symptoms or 4 days from the onset of severe symptoms - consistent with the national health committee new coronavirus pneumonia diagnosis and treatment plan (eighth edition), general or heavy diagnostic criteria.

inclusion criteria: - severe acute respiratory syndrome coronavirus2 (sars-cov-2) infection - within 7 days from the onset of clinical symptoms or 4 days from the onset of severe symptoms - consistent with the national health committee new coronavirus pneumonia diagnosis and treatment plan (eighth edition), general or heavy diagnostic criteria.