Length of stay;Length of severe;oxygenation index during treatment;all-cause mortality in 28 days;Peripheral blood cell count (including white blood cells; lymphocytes; neutrophils; etc.);procalcitonin;C-reactive protein;Inflammatory factors (including IL-6; IL-10; TNF-a; etc.);Lymphocyte subsets and complement;Coagulation indicators (prothrombin time; activated partial prothrombin time; fibrinogen; D-dimer; platelet count);Virus nucleic acid;

Length of stay;Length of severe;oxygenation index during treatment;all-cause mortality in 28 days;Peripheral blood cell count (including white blood cells; lymphocytes; neutrophils; etc.);procalcitonin;C-reactive protein;Inflammatory factors (including IL-6; IL-10; TNF-a; etc.);Lymphocyte subsets and complement;Coagulation indicators (prothrombin time; activated partial prothrombin time; fibrinogen; D-dimer; platelet count);Virus nucleic acid;