Group B streptococcus (GBS) is a bacteria that can be found in the vagina or rectum of healthy adult women. Although GBS is rare in pregnant women, if it is present a mother can pass it to her baby during delivery. A routine test is now performed as a part of prenatal care. The test involves swabbing the vagina and the rectum and sending the sample to a lab, where a culture is analyzed for any presence of GBS. If it is positive you will receive antibiotics during labour. We will give you more information should this end up pertaining to you.