Preventing GBS in Pregnancy

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July 24, 2017
GBS, pregnancy, GBS natural treatments, naturopath toronto, toronto naturopath

A common concern in the third trimester in pregnancy is GBS (group B strep).

This common bacteria is found in 10 – 35% of all healthy, adult women (in the vagina, rectum and urinary bladder). It’s normally kept in check by the Lactobacillis strains, but can certainly overgrow.

While most women don’t experience any symptoms associated with GBS, it can be passed to baby during birth. This may lead to some serious complications in newborns like primary neonatal sepsis (infection of the blood), pneumonia (infection of the lungs) and meningitis during (infection of the brain’s lining and spinal tissue).

Risk factors for GBS include:

  • African-American descent
  • Multiple sexual partners
  • Male-to-female oral sex
  • Frequent or recent sex
  • Tampon use
  • Infrequent hand-washing
  • Younger than 20 years old
  • Previous GBS+ pregnancy

When does the GBS swab happen?

A routine culture test is typically done to determine if a woman is GBS positive or negative around 35-37 weeks gestation. The rectum and vagina of the pregnant woman are swabbed with a Q-tip, and then sent for culture. 

What Happens If You Test Positive?

If you tests as GBS+, you’ll be given antibiotics during labour, or if your membranes break early. Although there isn’t a guarantee that you will transmit this bacteria to your baby, antibiotics are given to reduce this risk.

According to the SOGC, once you’re tested at 35-37 weeks, you’re not tested again.

Preventing GBS

As I previously mentioned, the SOCG does not recommend re-testing moms who tested positive for GBS at the time of birth (although your Midwife may do so). Therefore, we need to be proactive about this and improve the vaginal microbiome before the GBS swab is done. 

The beginning of the third trimester is a great time to establish a foundation of healthy gut flora, boost immune function, and ensure that your diet is conducive to a healthy gut. 

Women who have a history of UTIs and bladder infections or were GBS positive during a previous pregnancy, may benefit from seeking support early on in pregnancy (such as during the first trimester). 

Naturopathic Support for GBS

First Pregnancy

At 32-33 weeks, I encourage women to book an appointment with me to prepare their vaginal microbiome for the GBS swab. Most often probiotics and herbal immune support (like garlic and echinacea) are used to support a healthy vaginal microbiome.

Can You Choose Any Probiotic?

A 2016 study looked a how probiotics could affect vaginal flora after a woman has tested positive with GBS. Ninety-nine women were were all diagnosed by GBS culture as being GBS positive between 35 to 37 weeks. They were then split into two groups – treatment and placebo group. The treatment group took 2 oral probiotics capsules before bed (containing L. rhamnosus GR-1 and L. reuteri RC-14) until delivery, and the placebo group took 2 placebos before bed until delivery. 

At time of delivery, the women were re-tested (vaginally and rectally) to determine if they were still GBS positive. In the probiotic group 42.9% in women were no longer GBS positive, whereas in the placebo group, only 18% were no longer GBS positive. This is obviously quite exciting as those two probiotic strains had a positive effect on the microbiome and reduced GBS colonization!

Second+ Pregnancy

If you tested positive for GBS in prior pregnancies, I recommend booking an appointment at the beginning of the third trimester to begin to support vaginal health. I follow the same protocol as above, but treat for longer to help change the vaginal flora especially if you have had GBS before.  

Final Thoughts

If you have a history of GBS, UTI and/or yeast infections, and are hoping to improve your vaginal flora – book an appointment with me! We’ll work together to get your bacteria back in line, and hopefully stop those vaginal infections for good!


Ho M, Chang Y, Chang W et al. Oral Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 to reduce Group B Streptococcus colonization in pregnant women: A randomized controlled trial. Taiwanese Journal of Obstetrics and Gynecology. 2016;55(4):515-518. doi:10.1016/j.tjog.2016.06.003.

Management of Group B Streptococcal Bacteriuria in Pregnancy

Note: This article only discusses research in preventing a GBS+ colonization prior to a GBS culture done by an OB/GYN or midwife. It purposefully does not discuss what to do in the case of a positive GBS+ test. 

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