POC MxA levels (median [IQR]) were higher in children with a viral infection (571 [240–955] μg/L) compared to children with a bacterial infection (25 [25–54] μg/L, P < .001) or a noninfectious disease (25 [25–25] μg/L, P < .001) (Figure 2). The gene discussed is MX1; the disease is viral infectious disease.