The highest AUC for the distinction between bacterial and viral pneumonia was observed for CRP (AUC = 0.675; 95% CI: 0.634–0.715; p < 0.01), followed by the ANC (AUC = 0.658; 95% CI: 0.616–0.7; p < 0.01), WBC (AUC = 0.606; 95% CI: 0.562–0.649; p < 0.01), CRP/PCT (AUC = 0.592; 95% CI: 0.545–0.638; p < 0.01), and PCT (AUC = 0.589; 95% CI: 0.545–0.633; p < 0.01) (Table 3). Here, CRP is linked to viral pneumonia.