As shown in Fig. 3, nCD64 levels were significantly elevated in bacterial infection patients compared to healthy controls (CD64 ratio: P = 0.001; CD64 index: P < 0.001) and viral infection patients (CD64 ratio: P < 0.001; CD64 index: P < 0.001) (Fig. 3A and B). The gene discussed is FCGR1A; the disease is viral infectious disease.