Patients with severe COVID-19 exhibited higher absolute counts of neutrophils (NEUs) (3.29 (2.46, 4.2) × 109/L versus 5.32 (3.92, 7.86) × 109/L, P < .001) and levels of C-reactive protein (CRP) (8.06 (5.12, 30.91) mg/L versus 34.30 (18.97, 67.79) mg/L, P < .001), blood urea nitrogen (3.94 (3.03, 5.01) mmol/L versus 5.21 (3.53, 6.67) mmol/L, P = .016), lactic dehydrogenase (197.00 (156.50, 247.00) U/L versus 283.50 (204.00, 394.75) U/L, P < .001), and procalcitonin (PCT) (0.04 (0.02, 0.08) ng/ml versus 0.06 (0.04, 0.15) ng/mL, P = .024). Here, CRP is linked to COVID-19.