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Pregnancy and sexual health guide · 2026
Group B strep carriage is common and harmless in adults. Its entire clinical significance sits in one window late in pregnancy.
Group B Streptococcus (GBS) is a bacterium carried in the bowel and genital tract of a substantial proportion of healthy adults. It is not a sexually transmitted infection and carriage in a non-pregnant adult almost never requires treatment. Its importance is in pregnancy: GBS can be transmitted to the baby during labour and is a leading cause of early-onset neonatal sepsis. Where a screening approach is used, combined vaginal and rectal swabs are collected at around 36 to 37 weeks, and a positive result means intrapartum antibiotics are given during labour rather than during pregnancy.
| Not an STI | Common commensal carriage; not sexually transmitted in the conventional sense |
|---|---|
| Screening timing | Around 36–37 weeks of pregnancy, where a screening approach is used |
| Samples | Combined lower vaginal and rectal swabs — rectal sampling raises detection |
| A positive means | Antibiotics during labour, not during pregnancy |
| Also relevant | GBS bacteriuria at any point in pregnancy, and a previous affected baby |
| Price | Listed on the MedEx STD and STI testing page and the lab test catalogue |
GBS colonises the gastrointestinal and genital tracts of many healthy adults, intermittently or persistently. It causes no symptoms in the great majority and is not something a non-pregnant adult usually needs treated.
Because it appears on some multiplex genital panels, people are frequently alarmed by a positive result outside pregnancy. In that context it is generally an incidental finding. It can occasionally cause urinary tract infection or, rarely, invasive disease in older adults or those with significant comorbidity — those situations are clinically obvious rather than screen-detected.
If a panel returned GBS and you are not pregnant, review it with a clinician before assuming treatment is needed. The broader principle is covered in the STI PCR panel guide.
A baby can acquire GBS during passage through the birth canal. Early-onset neonatal GBS disease presents within the first week of life and can cause sepsis, pneumonia and meningitis. It remains a leading cause of neonatal sepsis worldwide.
Intrapartum antibiotic prophylaxis — antibiotics given intravenously during labour to the mother — substantially reduces the risk of early-onset disease. This is why the timing of the intervention is during labour, not during pregnancy: treating carriage earlier in pregnancy does not reliably prevent recolonisation by the time of delivery.
Countries differ in approach. Some, including the United States, use universal screening at 36–37 weeks. Others use a risk-factor-based approach without routine screening. Either approach requires an antenatal plan, so discuss it with your obstetric team early rather than at the point of labour.
Planning a 36-week screen? Swabs can be collected at home in Bangkok.
Where screening is used, the sample is a combined lower vaginal and rectal swab, collected at around 36 to 37 weeks. Rectal sampling matters — a vaginal swab alone detects meaningfully fewer carriers, since the bowel is the main reservoir.
Culture using an enrichment broth is the established method and is what most screening protocols specify. PCR is faster and can be used intrapartum where a result is needed quickly, though availability and validation vary.
The timing is deliberate. Colonisation fluctuates, so a swab taken much earlier in pregnancy does not reliably predict carriage at delivery. A result is generally considered valid for around five weeks.
Swabs can be collected in clinic, at home in Bangkok, or with support from the nurse-at-home service.
A positive screen does not mean you or your baby are unwell. It means a plan is put in place: intravenous antibiotics during labour, ideally started at least four hours before delivery, and observation of the baby afterwards according to local protocol.
Other situations that trigger intrapartum prophylaxis regardless of a 36-week swab:
Tell your delivery team about penicillin allergy well in advance, since alternatives require susceptibility testing and that takes time to arrange.
For broader antenatal testing including prenatal screening options, see the MedEx checkup packages or arrange an obstetric specialist teleconsultation.
No. GBS is a common commensal carried in the bowel and genital tract of many healthy adults. Carriage in a non-pregnant adult almost never requires treatment.
Where a screening approach is used, at around 36 to 37 weeks. Colonisation fluctuates, so a swab taken much earlier does not reliably predict carriage at delivery.
Combined lower vaginal and rectal swabs. A vaginal swab alone detects meaningfully fewer carriers, since the bowel is the main reservoir.
Intravenous antibiotics are given during labour, ideally at least four hours before delivery, and the baby is observed afterwards according to local protocol. Treating carriage during pregnancy is not effective because recolonisation occurs.
Antibiotics are usually given if risk factors are present, such as preterm labour, prolonged rupture of membranes or fever in labour.
Usually not. It is generally an incidental finding representing normal carriage. Discuss the result with a clinician rather than assuming antibiotics are required.
Positive result outside pregnancy is usually incidental.
Medical disclaimer: This article is general health information and does not replace medical advice, diagnosis or treatment. Laboratory reference ranges differ between laboratories and results must be interpreted alongside your symptoms, medicines and medical history. Speak with a qualified clinician before starting, stopping or changing any treatment. Service details, inclusions and prices can change — confirm them with MedEx before booking.
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