Jonaidi Jafari et al28 had 70% sensitivity and 74% specificity with the cut-off for PCT of 0.21ng/mL and in our study, for predicting the presence of infection demonstrated a sensitivity of 63.6%, specificity of 83.2%, at the best cut-off at 0.25ng/mL with AUC of 0.79. This evidence concerns the gene CALCA and infection.