Blood cells’ counts, including white blood cells (WBC), monocyte (Mono), lymphocyte (Lym), and neutrophils (Neu) in the peripheral blood of healthy control (as HC) (male = 7, female = 14), common viral CAP cases (as VP) (male = 30, female = 24) and the COVID-19 patients (as nCoV) (male = 13, female = 23) classified into two categories by sex: male and female. Comparisons were done by the Mann–Whitney U test. *P<0.05; **P<0.01; ***P<0.001; ****P<0.0001.