Methods: Lactobacilli species were identified by use of biochemical method, acquired the distribution of lactobacillus in the vagina of pregnant women, compared ability of producing H2O2.

• 方法：采用生物化学的方法对孕妇阴道内乳酸杆菌进行鉴定，观察H2O2阳性乳酸杆菌的分布及其对妊娠结局的影响。