inclusion criteria: - age 18-75 years - sars-cov-19 pcr positive - moderate stage and above - time from onset to screening ≤ 21 days, the sars-cov-2 test is still positive

inclusion criteria: - age 18-75 years - sars-cov-19 pcr positive - moderate stage and above - time from onset to screening ≤ 21 days, the sars-cov-2 test is still positive