In the group of 30 pregnant women with bacterial infection, the levels of all human Th1/Th2‐related cytokines (IL‐2, IL‐4, IL‐6, IL‐10, TNF‐α and IFN‐γ) had no significant causal correlation with the nCD64 index (r = −0.0518, P = 0.7858; r = −0.0473, P = 0.8041; r = 0.1997, P = 0.29; r = −0.0888, P = 0.6409; r = 0.1636, P = 0.3876 and r = 0.1472, P = 0.4377, respectively). This evidence concerns the gene IFNG and bacterial infectious disease.