Median (IQR) C-reactive protein (CRP) plasma levels in children with confirmed and no confirmed viral infection were 10 (5–14) mg/L and 34 (10–45) mg/L, and procalcitonin levels were 0.1 (0.1–0.3) μg/L and 0.1 (0.1–0.3) μg/L, respectively. The gene discussed is CRP; the disease is viral infectious disease.