The CRP, PCT and WBC levels of the patients in the bacterial infection group were higher than those of the non-bacterial infectious diseases and the control group, and the difference had statistical significance (P<0.05); the CRP, PCT and WBC levels of the patients in the non-bacterial infection group were higher than those of subjects in the control group, and the difference were statistically significant (P<0.05) (Table-I). This evidence concerns the gene CALCA and bacterial infectious disease.