The fevered COVID-19 patients had a lower lymphocyte proportion (median, 25.0 vs. 31.7%, P = 0.000), lower lymphocyte counts (median, 1.0 vs. 1.5 × 109/L, P = 0.000), higher levels of C-reactive protein (CRP) (median, 20.2 vs. 3.8 mg/L, P = 0.000), higher erythrocyte sedimentation rate (ESR) levels (median, 48.0 vs. 27.0 U/L, P = 0.000), and a higher proportion of elevated procalcitonin (30.9 vs. 16.4%, P = 0.036; Table 2). Here, CRP is linked to COVID-19.