14/08/2014 16:49 BST | Updated 22/05/2015 10:12 BST

Group B Streptococcus: Know The Signs Of Infection

Group B streptococcus: Know the signs of infection

Group B streptococcus (often known as group B strep, and sometimes GBS) is a bacteria which can cause infections in newborns. It affects one in every 2,000 babies born and it's usually treated effectively, but in some rare cases its effects can be devastating, so it's good to be aware of the signs.

What is it?

Many pregnant mums carry the group B strep bacteria – in their gut or in their vagina – without knowing it. Sometimes, it will be picked up during a vaginal swab but the bacteria comes and goes and it usually causes no problems or symptoms in adults.

About half of mothers who have group B strep during pregnancy will pass it on to their baby during birth (either vaginal or caesarean), but the majority of babies who are exposed to the bacteria from their mothers do not develop infection. Occasionally, however, this can happen, and sometimes that can lead to problems.


Although rare, group B strep is the leading cause of serious infection in newborns.


Early-onset infection (which presents itself within six days of birth, but most often within 24-48 hours) affects approximately 340 babies in the UK each year. Late-onset infections are more rare and present after six days.

Most babies who develop an infection are successfully treated, but for some it can cause serious illness, including meningitis, pneumonia and septicaemia (blood poisoning). One in 10 babies who become infected will die. Another one in five babies affected will develop long-lasting complications, which can include deafness, blindness, cerebral palsy and learning difficulties.

What can I do?

Babies who present signs very early might well still in hospital or under medical supervision. But mums and babies often get sent home fairly quickly, so, wherever your baby is born, it is important to know the signs of an early-onset group B strep infection.

They include:

Lethargy and floppiness

Not feeding well

Abnormal heart rate (either fast or slow)

Abnormal breathing rate (either fast or slow)

Abnormal temperature (either high or low)


Irritability (for example when being held).

Not all of these will necessarily be present.

Around 10 or more in some places, and group B strep hasn't become resistant.

A smattering of NHS hospitals do offer screening specifically for group B strep, and GBSS recommends pregnant women find out whether their local hospital is one of them – you can check here. If not, you can purchase sensitive testing kits privately (a test will cost around £35 and will be posted to you). Click here for a list of laboratories offering tests which meet the Health Protection Agency's standard.

Tests should include a form on which you can fill in the details of your health practioners, and they will be informed if you test positive for group B strep. If that happens, in the UK you should be offered intravenous antibiotics during labour to help prevent passing the bacteria on to your baby. In other words, the NHS will offer you antibiotics for a positive result, it is just unlikely they will help you discover whether you are carrying the bacteria in the first place.

More resources:

For more information about group B strep, and the public consultation, visit the GBSS website.