Rectovaginal colonization by group B streptococcus

: The influence of various factors, including age, pregnancy, contraceptive methods, menstrual cycle and use of vaginal tampons, on rectal and vaginal colonization with group B streptococci was investigated in 81 women, 25 of whom were pregnant. The organism was found more frequently in the anus (22.2%) than in the vagina (16%) or the pharynx (2.4%). The colonization rate was higher in women younger than 20, and higher in non pregnant (30%) than in pregnant (12%) women. It was also higher during the first phase of the menstrual cycle (45.4%) than during the second phase (21.8%). No significant difference was observed between users and non-users of intrauterine devices, oral contraceptives and vaginal tampons.