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Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition) ›› 2024, Vol. 18 ›› Issue (03): 170-175. doi: 10.3877/cma.j.issn.1674-1358.2024.03.007

• Research Article • Previous Articles    

Predictive value of group B Streptococcus infection typing for preterm premature rupture of membranes of pregnant women and its relationship with chorioamnionitis

Shengrong Zhang1,(), Xiaodong Li1, Wei Wang1   

  1. 1. Department of Neonatology, Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Shenzhen 518000, China
  • Received:2023-12-01 Online:2024-06-15 Published:2024-08-26
  • Contact: Shengrong Zhang

Abstract:

Objective

To investigate the predictive value of serum typing of group B Streptococcus infection in vaginal colonization for preterm premature rupture of membrane (PPROM) of pregnant women and its relationship with chorioamnionitis.

Methods

Total of 247 pregnant women with group B Streptococcus infection who underwent regular prenatal checkups and completed delivery at Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Guangdong Province from January 2019 to December 2022 were selected. They were divided into PPROM group (72 cases) and normal group (175 cases). The general information of two groups of pregnant and postpartum women were compared, the risk factors of premature rupture of membranes in pregnant and postpartum women were analyzed by multiple Logistic regression analysis, a Logistic regression analysis prediction model and the validated model were established, respectively. The relationship between different subtypes of group B Streptococcus infection and chorioamnionitis were analyzed by Logistic regression analysis.

Results

There were significant differences between the two groups in family history of diabetes (χ2 = 3.924, P = 0.048), diabetes in pregnancy (χ2 = 4.773, P = 0.029), serum zinc (t = 3.176, P = 0.002), vaginitis (χ2 = 9.076, P = 0.003), weight gain in pregnancy (t = 2.181, P = 0.030), frequent consumption of fried food in pregnancy (χ2 = 4.287, P = 0.038) and salty diet in pregnancy (χ2 = 4.061, P = 0.044). Group B Streptococcus infection in PPROM patients was mainly type Ⅲ, with an infection rate of 76.39%, which was significantly higher than that of the normal group (χ2 = 24.442, P < 0.001). Pregnant diabetes (OR = 1.730, 95%CI: 1.067-2.289, P = 0.013), vaginitis (OR = 1.632, 95%CI: 1.356-2.931, P = 0.016), group B Streptococcus type Ⅲ (OR = 2.009, 95%CI: 1.674-2.783, P = 0.009) were all independent risk factors for PPROM, and serum zinc > 10.25 μmol/L (OR = 0.516, 95%CI: 0.282-0.927, P = 0.010) was protective factors for PPROM. Logistic regression results showed that after adjusting for confounding factors, the risk of developing chorioamnionitis in patients with group B Streptococcus type Ⅰa (OR = 0.79, 95%CI: 0.54-0.95), type Ⅴ (OR = 0.68, 95%CI: 0.43-0.94), type Ⅱ (OR = 0.54, 95%CI: 0.14-0.83) and type Ⅰb (OR = 0.30, 95%CI: 0.18-0.65) infection were significantly lower than that in patients with group B Streptococcus type Ⅲ infeciton, with significant differences (all P < 0.001).

Conclusions

PPROM patients are mainly infected with group Ⅲ Streptococcus, which is an independent risk factor for preterm premature rupture of membranes. The risk of developing chorioamnionitis in group Ⅲ Streptococcus infection is significantly higher than that of other subtypes infeciton.

Key words: Premature rupture of membranes before term, Group B Streptococcus infection, Infection type, Chorioamniitis, Interaction

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