After you give birth, if your doctor suspects your baby has group B strep disease, a sample of your baby's blood or spinal fluid will be sent to a lab for evaluation.

If your baby appears ill, he or she might be given other tests, including:

  • Urine culture
  • Lumbar puncture
  • Chest X-ray

For adults who are diagnosed with an infection, a blood test can determine if group B strep is the cause. Identifying the cause may be important for determining the appropriate treatment.



If your baby tests positive for group B strep, he or she will be given intravenous (IV) antibiotics. Depending on your baby's condition, he or she might need intravenous (IV) fluids, oxygen or other medications.


Antibiotics are effective treatment for group B strep infection in adults. The choice of antibiotic depends on the location and extent of the infection and your specific circumstances.

If you're pregnant and you develop complications due to group B strep, you'll be given oral antibiotics, usually penicillin, amoxicillin (Amoxil, Larotid) or cephalexin (Keflex). All are considered safe to take during pregnancy.

Sep 21, 2021

  1. AskMayoExpert. Group B streptococcus (GBS) infection. Mayo Clinic; 2021.
  2. Puopolo KM, et al. Group B streptococcal infection in neonates and young infants. https://www.uptodate.com/contents/search. Accessed July 16, 2019.
  3. Group B strep (GBS). Centers for Disease Control and Prevention. https://www.cdc.gov/groupbstrep/index.html. Accessed July 16, 2019.
  4. Puopolo KM, et al. Management of infants at risk for Group B streptococcal disease. Pediatrics. 2019;144:e1881.
  5. Puopolo KM, et al. Group B streptococcal infection in pregnant women. https://www.uptodate.com/contents/search. Accessed July 12, 2021.
  6. Partin AW, et al., eds. Infections of the urinary tract. In: Campbell-Walsh-Wein Urology. 12th ed. Elsevier; 2021. https://www.clinicalkey.com. Accessed July 12, 2021.
  7. American College of Obstetricians and Gynecologists Committee on Obstetric Practice. Committee opinion No. 797: Prevention of group B streptococcal early-onset disease in newborns. Obstetrics and Gynecology. 2020; doi: 10.1097/AOG.0000000000003668.


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