Causes Of Strep B In Pregnancy

Understand The Causes Of Strep B In Pregnancy!

Pregnancy is a beautiful journey, but it comes with its own set of challenges and concerns. Strep B, or Group B Streptococcus (GBS), is one such issue that can affect pregnant women.

In many cases, GBS is harmless and does not cause any symptoms or health issues. However, it can become a concern during pregnancy due to the potential risk of transmitting the bacteria to the newborn during childbirth.

In this blog, we will explore the causes and implications of Group B Strep during pregnancy in the UK.

How Does Group B Strep Affect Pregnant Women? - Elitecare Emergency Hospital

How Is It Caused?

The primary cause of Strep B in pregnancy is the transmission of the bacteria from the mother to the baby. Have a look at the reasons-

  • Natural Colonization:

One of the primary causes of Strep B in pregnancy is the natural colonization of the bacteria in the genital and rectal areas. The bacteria can reside in these areas without causing any harm to the mother, but the risk of transmission to the baby during childbirth is present.

  • Unknown Carrier Status:

Unlike some infections that display noticeable symptoms, Strep B can be asymptomatic in pregnant women. This means that a woman may be a carrier of the bacteria without being aware of it. Regular prenatal screenings are crucial to identify carriers and take appropriate measures.

  • Previous History of Strep B Infection:

If a woman has previously had a Strep B infection during a previous pregnancy, the likelihood of recurrence is increased. Understanding one’s medical history, especially regarding infections during pregnancies, allows for proactive management and prevention strategies.

  • Proximity to the Delivery Date:

The risk of Strep B transmission is higher as the delivery date approaches. Carrying out screenings closer to the due date helps healthcare providers determine the colonization status and administer preventive measures during labor.

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What Are Its Implications?

  • Strep B in pregnant women usually does not cause any symptoms.
  • It’s detected through routine screening between 35 to 37 weeks of pregnancy.
  • However, if left untreated, it can lead to serious complications for the baby, such as pneumonia, sepsis, and meningitis.


Understanding the causes of Strep B in pregnancy is a vital step in ensuring the well-being of both the mother and the baby. Prenatal screenings, timely interventions, and awareness can significantly reduce the risk of transmission and pave the way for a healthy and happy childbirth experience.

If you’re pregnant or planning to be, discuss Strep B screening and prevention strategies with your healthcare provider to ensure a safe and smooth journey into motherhood. Concepto Diagnostics is the trusted healthcare provider for you to understand the treatment guidelines for the Group B Strep Test in the UK.


Also Read: What is the current Group B Strep Testing procedure during pregnancy in the UK?