What percentage of healthy adult women typically carry group B strep bacteria?

The correct answer is that approximately 25% of healthy adult women typically carry group B Streptococcus (GBS) bacteria. This colonization is generally asymptomatic and occurs in the lower gastrointestinal tract and the vaginal area. While many individuals may carry the bacteria without any adverse effects, it is significant in the context of pregnancy due to the potential risk it poses for newborns, such as early-onset group B streptococcal disease.

Understanding the prevalence of GBS colonization in healthy adults is crucial for guiding screening practices during pregnancy. Routine testing for GBS is advised for pregnant women around 35 to 37 weeks of gestation to assess the risk of transmitting the bacteria to the baby during childbirth. This practice aims to reduce the incidence of GBS-related infections in newborns.