Diagnosis

If your newborn might have group B strep disease, a sample of your baby's blood or spinal fluid likely will be taken. A lab checks the sample for the bacteria that causes the infection.

If your baby appears ill, the baby might be given other tests, including:

  • Urine culture.
  • Lumbar puncture.
  • Chest X-ray.

For adults who have an infection, a blood test can find out if group B strep is the cause. Learning the cause may be important for figuring out the right treatment.


Treatment

Infants

If your baby tests positive for group B strep, the baby receives IV antibiotics through a vein. Depending on your baby's condition, the baby might need IV fluids, oxygen or other medicines.

Adults

Antibiotics can treat group B strep infection in adults. The choice of antibiotic depends on the location and extent of the infection. It also depends on your specific circumstances.

If you're pregnant and you have medical problems because of group B strep, you'll likely receive antibiotics by mouth. Most often, you'll be given penicillin, amoxicillin (Amoxil, Larotid) or cephalexin. All are considered safe to take during pregnancy.


Apr 19, 2025

  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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