Group B Strep Carrier in Pregnancy: What to Know

Group B streptococcus, also called GBS, is a type of bacterium that can live naturally in the digestive and genital tracts. Carrying it is not the same as having an infection, and it does not mean you are ill or that you have a sexually transmitted infection. Many carriers have no symptoms. The result can change over time, so a positive test describes what was found when the sample was taken. GBS can be passed to a baby during labour or after the waters break. Most exposed newborns remain well, but a small number can develop a serious infection, which is why the maternity team records the result and plans care around birth.

Tell your obstetrician, midwife, labour ward, or birth facility about the positive result, especially if you change hospitals or providers. Keep the result with your pregnancy records and ask how your maternity unit follows its local testing and treatment protocol. If antibiotics are advised, they are generally given through a vein during labour and continued according to the clinical plan. Treatment before labour usually does not clear carriage reliably, so do not start antibiotics on your own. A planned caesarean birth before labour and before the waters break may alter the plan; your obstetrician should explain what applies to you.

Contact your maternity unit promptly when labour starts or your waters break, and say that you carry GBS so the team can review the plan. Seek urgent advice for fever, feeling acutely unwell, severe abdominal pain, heavy bleeding, or noticeably reduced fetal movement. These symptoms can have causes unrelated to GBS, but they need timely pregnancy assessment. If you cannot reach your usual clinician, use the urgent maternity service advised by your birth facility.

Ask when your result was recorded, where it is documented, and which symptoms or events should prompt you to call. You can also ask which antibiotic is planned, whether you have any allergy-related alternatives, where treatment will be given, and how your baby will be observed after birth.