How do u get strep b?

Endemic: Group b strep (gbs) is present in or on the body of almost everyone. For pregnancy care we obtain a culture of the vagina, perineum, and anus at about 35 to 37 weeks to determine if gbs is present - which it is about 1/3 of the time. The gbs is present in the bowel in most people and it can travel to the vaginal and even sometimes cause bladder infections when it gets into the bladder.