Baseline characteristics
According to the normal value of CD4+T cells, the 105 severe COVID-19 patients were divided into two groups: low CD4+T cell count (<404 cells/ul) group and high CD4+T cell count (≥404 cells/ul) group. Compared with patients in the high group, in terms of laboratory findings, patients in the low CD4+T cell count group showed lower median platelet count, lymphocyte percentage, lymphocyte count, estimated glomerular filtration rate, total cholesterol, low density lipoprotein, CD3+T cell count, CD4+T cell count, CD8+T cell count, but a higher median creatinine level. In terms of computed tomography findings, patients in the high group more often represented as local patchy shadowing. Detailed features of laboratory data, symptoms, treatments and outcomes are shown in the table1.