CALCA and bacterial infectious disease: When the ROC curves were constructed based on the peak value of inflammatory markers, the AUC (95% CI) of peak PCT was 0.840 (0.712–0.968), whereas other inflammatory markers showed a relatively lower accuracy to predict the bacterial infection (CRP: 0.699 (0.563–0.834); WBC counts: 0.576 (0.357–0.796); neutrophil percentage: 0.713 (0.565–0.862)) than PCT (Figure 2(b)).