Streptococcus lactis is a specific pathogenic microorganism, also known as group B streptococcus. This pathogenic microorganism can live in the vagina of women, but does not cause any obvious pathological reaction. During pregnancy and delivery, it may invade the birth canal and cause puerperal infections, and may also invade the newborn through the birth canal and cause serious infectious diseases in the newborn. Neonatal infections with this pathogen are often serious and can increase neonatal mortality. Women found to have vaginal streptococcus aureus infection, regardless of once the symptoms of labor should be treated, antibacterial drug treatment to penicillin as the first choice of drugs, penicillin allergy can be selected erythromycin, clindamycin and so on.