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of the Chinese protocol severity classification, PSI, and CURB-65 was 0.735, 0.951, and 0.912. The optimal cut-off point of PSI was risk class Ⅳ, and the sensitivity and specificity for predicting mortality were 90.9% and 90.5%. The optimal cut-off point of CURB-65 was score 2, and the corresponding sensitivity and specificity were 84.8% and 85.6%. Conclusions PSI and CURB-65 can be used for risk stratification and prognostic assessment in patients with COVID-19.COVID-19 is an acute infectious disease caused by a newly discovered coronavirus