Group B strep

Also called GBS or Group B streptococcus

Group B strep (GBS) is a type of bacteria that lives in the gut and vagina of many people without causing harm. In pregnancy, it can rarely pass to the baby around the time of birth and cause a serious infection, such as sepsis, pneumonia or meningitis.

Last updated Nov 9, 2026

What it is

If GBS is found during pregnancy, or a previous baby had a GBS infection, antibiotics are usually given during labour to protect the baby.

Most babies born to mothers who carry GBS are healthy.

Common signs

  • Usually no symptoms in adults
  • In babies: grunting, poor feeding, being floppy or very sleepy
  • In babies: high or low temperature, fast or slow breathing

How it is usually diagnosed

  • A swab or urine test in pregnancy, sometimes
  • Blood and other tests in a baby who is unwell

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Pregnancy swab or urine results
  • Notes on antibiotics in labour
  • Baby discharge letters

Questions to ask your doctor

  • Should I be tested for GBS?
  • Will I need antibiotics in labour?
  • What signs should I watch for in my baby?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • A newborn who is floppy, grunting, not feeding, very sleepy or has a high or low temperature: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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