NPPB and acute kidney injury: We revealed that patients with stage 2 or 3 AKI had more days from onset to admission, and higher serum levels of ALT, AST, LDH, uric acid, Cys-C, β2-MG, AMY, lipase, CK-MB, TnI, BNP, D-dimer, CRP, PCT, IL-6, ESR, viral load and urine RBC count than patients with stage 1 AKI (Supplementary Table S1).