CRP and COVID-19: We compared six biochemical indices, including lactate dehydrogenase (LDH), platelet counts (PLT), neutrophilic granulocyte count (NEUT), white blood cell count (WBC), C-reactive protein (CRP), and LYM_N, among healthy, mild-type COVID-19, moderate-type COVID-19, and non-COVID-19 pneumonia groups (Figure 1).