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Group B strep

Group B strep is normally harmless and most people will not realise they have it.

It's usually only a problem:

  • if you're pregnant – it could spread to your baby
  • in young babies – it can make them very ill
  • if you're older or you're already very ill – it can cause repeated or serious infections

This page focuses on group B strep in pregnancy and babies.

Group B strep in pregnancy

Group B strep is common in pregnancy and rarely causes any problems.

It's not routinely tested for, but may be found during tests carried out for another reason, such as a urine test or vaginal swab.

Risks in pregnancy

If you have group B strep while you're pregnant:

  • your baby will usually be healthy
  • there's a small risk it could spread to your baby during labour and make them ill – this happens in about 1 in 1,750 pregnancies
  • there's an extremely small risk you could miscarry or lose your baby

What to do if you're worried

If you're worried about group B strep, speak to your midwife or GP for advice.

Talk to them about the risks to your baby and ask their advice about whether to get tested.

Routine testing is not currently recommended and tests are rarely done on the NHS. This is because group B strep is very common and testing cannot predict whether a baby will get an infection. You can pay for a test privately.

What happens if you have group B strep

If tests find group B strep while you're pregnant, or you've had a baby that's been affected by it before, you may need extra care and treatment.

You may be advised to:

  • speak to your midwife about your birth plan – they may recommend giving birth in hospital
  • contact your midwife as soon as you go into labour or your waters break
  • have antibiotics into a vein during labour – this can significantly reduce the risk of your baby getting ill
  • stay in hospital for at least 12 hours after giving birth so your baby can be monitored – this is not always necessary
Group B strep in babies

If you had group B strep during pregnancy, there's a small risk it could spread to your baby and make them very ill.

If this happens, it's usually soon after they're born. Your baby may be monitored in hospital for up to 12 hours to check for any problems.

They'll be given antibiotics into a vein if they develop symptoms.

What to look for after leaving hospital

Occasionally, symptoms of a group B strep infection in a baby can develop up to 3 months after birth.

Symptoms may include:

  • being floppy or not responding normally
  • grunting when breathing, or working hard to breathe when you look at their chest or stomach
  • very fast or slow breathing
  • an unusually high or low temperature
  • changes in their skin colour or blotchy skin
  • not feeding well or vomiting milk up
  • an unusually fast or slow heart rate

Call 999 or go to A&E if:

  • your baby has symptoms of a group B strep infection

They may need treatment with antibiotics in hospital immediately.

Do not drive to A&E. Ask someone to drive you or call 999 and ask for an ambulance.

Bring any medicines you take with you.

Risks of group B strep in babies

Most babies with a group B strep infection make a full recovery if treated.

Some babies may develop serious problems like sepsis or meningitis.

This can cause lasting problems like hearing loss or loss of vision. Sometimes it can be fatal.

More information
Last Reviewed
13 June 2024
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