Group B Strep (GBS) in Pregnancy: India Screening, Antibiotics & What to Ask

• GBS is normal vaginal and gut bacteria, not a sexually transmitted infection and nothing to do with hygiene. Carrying it causes you no symptoms or illness.
• It only matters during birth: untreated, it causes serious newborn infection in roughly 1–2 babies per 1,000 births. Antibiotics in labour cut that risk by about 90–95%.
• Western countries swab every woman at 35–37 weeks. India does not screen routinely — most hospitals use a risk-factor-based protocol from FOGSI instead.
• Five risk factors trigger antibiotics in labour even without a swab: a previous GBS-affected baby, GBS in a urine culture this pregnancy, preterm labour, waters broken over 18 hours, or fever in labour.
• The antibiotic (IV penicillin) needs at least two doses, four hours apart, before delivery for full protection — so it is started early in labour.
• Even with treatment, watch your newborn for fever, poor feeding, fast breathing or floppiness in the first week and seek care urgently if they appear.

Group B Streptococcus — scientific name Streptococcus agalactiae, almost always shortened to GBS — is a bacterium that lives as part of the normal flora of the human body. In women it naturally colonises the vagina, rectum, perineum and sometimes the urinary tract, in much the same way that other harmless bacteria live on your skin or in your mouth.

Carrying GBS is not an infection and not an illness. It produces no symptoms, and most women have no idea they carry it unless a swab is taken and cultured. Indian studies put the carrier rate at roughly 12–15% of pregnant women, towards the lower end of the global range of about 10–30%. The rate even varies between pregnancies in the same woman, which is why screening is done close to the due date where it is offered at all.

GBS is emphatically not a sexually transmitted infection, and it has nothing to do with hygiene, washing, diet or lifestyle. It is simply one of the many bacteria that make up a healthy vaginal balance. It does not need treatment outside pregnancy. The only reason it matters is the brief moment during birth when a vulnerable newborn meets a bacterium that would never bother an adult.

The clinical concern is early-onset GBS disease in the newborn — an infection that, by definition, appears in the first seven days of life, most often in the first 24–48 hours. During a vaginal delivery the bacterium reaches the baby as it passes through the birth canal, settles on the skin, airways or gut, and in a small number of cases invades the bloodstream. From there it can cause sepsis, pneumonia or meningitis, and at its most severe it can be fatal or leave lasting injury such as hearing loss or developmental delay.

Put the risk in perspective. Without any intervention, early-onset GBS disease occurs in roughly 1–2 babies per 1,000 births to carrier mothers. With intravenous antibiotics given to the mother in labour, that falls to around 0.5 per 1,000 — a reduction of about 90–95%. Many women receive the antibiotic for each infection prevented, but the prevention is real, and a newborn infection is a serious illness at a fragile moment.

There is also late-onset GBS disease, between one week and three months of age. It is less common, has different mechanisms, and is not prevented by antibiotics in labour — so this article focuses on the early-onset window, which intrapartum antibiotics are designed to stop. To slot a GBS question into the rest of your delivery choices, a birth plan is the right framework.

In the United States, the CDC has recommended universal GBS screening since the early 2000s: a vaginal-rectal swab taken at 35–37 weeks and cultured. The United Kingdom and most of Europe follow a similar standard. Women who test positive are flagged, and the moment they go into labour, intravenous antibiotics begin.

India does not yet have universal GBS screening as routine antenatal care. Most government hospitals do not offer the swab at all, and the cost and logistics of swabbing every woman at 35–37 weeks have prevented adoption at scale. In private hospitals the test is technically available — most large lab chains and corporate hospital labs run a GBS culture for roughly ₹500–2,000 on request — but it is rarely done by default. Many women only learn the test exists when they ask, and many obstetricians order it only if it is raised or if a specific risk factor prompts the conversation.

Filling this gap is the Federation of Obstetric and Gynaecological Societies of India (FOGSI) guidance, which favours a risk-factor-based approach over universal screening. Every woman in labour is assessed for a defined set of risk factors, and intravenous antibiotic prophylaxis is given to anyone with at least one of them, swab or no swab. It is imperfect — risk-based prophylaxis misses some GBS-positive women that screening would catch — but it works at the scale of the Indian system and prevents a meaningful share of newborn infections. The same logic of asking early applies across your week-by-week antenatal visits.

• A previous baby with proven GBS infection. Once a woman has had a newborn with GBS sepsis, pneumonia or meningitis, every future delivery automatically qualifies for antibiotics in labour, whatever the culture shows next time.
• GBS bacteriuria in this pregnancy. If a urine culture at any point this pregnancy grew GBS at a significant count, carrier status is confirmed and antibiotics are indicated — heavy colonisation makes passing it to the baby more likely. (See more on urinary tract changes and infection in pregnancy.)
• Preterm labour before 37 completed weeks. Premature babies are far more vulnerable to GBS because their immune system is less mature and protective antibodies from the mother are incomplete, so prophylaxis is given without waiting for a culture. Learn the warning signs of preterm labour.
• Ruptured membranes for more than 18 hours before delivery. Once the amniotic barrier has been broken longer than 18 hours, the risk of ascending infection rises sharply, and antibiotics are started even without a known GBS result.
• Maternal fever in labour above 38°C. A temperature above 38°C in labour may signal chorioamnionitis (infection of the membranes and amniotic fluid), so broad-spectrum antibiotics that also cover GBS are started promptly.

The first-line drug is intravenous penicillin G, given as a loading dose when labour starts and then repeated every four hours until delivery. When penicillin is in short supply, intravenous ampicillin works against GBS in much the same way. For women with a confirmed penicillin allergy, the choice depends on how severe past reactions have been and on local sensitivity results — clindamycin is commonly used when the isolate is known to be sensitive, and vancomycin is held in reserve for severe allergy or resistant strains.

The single most important practical fact is timing. For full protection, you need at least two doses, at least four hours apart, before your baby is born. That is why the antibiotic begins as soon as active labour is established or the waters rupture — whichever comes first — not when delivery is imminent. A woman who arrives in advanced labour and delivers within an hour cannot get full prophylaxis simply because there is no time, which is one reason obstetric teams take the onset of labour and waters breaking so seriously. Knowing the stages of labour helps you understand when that clock starts.

Prophylaxis is not perfect even when given on time. Breakthrough infection still occurs in a small minority of treated babies — the risk is greatly reduced, but not zero. That is why a GBS-exposed baby is still observed carefully for the first 48–72 hours, and why the newborn warning signs below matter even when everything went to plan.

If a Healing from a C‑Section: A Comprehensive Guide is done before labour starts and before the membranes have ruptured, the baby never passes through the birth canal, and the risk of GBS transmission is much lower. In that specific situation — a planned caesarean with intact membranes and no labour — GBS prophylaxis is not recommended, even in a known carrier. The pre-operative antibiotic given as standard surgical prophylaxis is a different drug, for a different reason, and is not a substitute for GBS prophylaxis.

If a woman scheduled for a caesarean goes into labour first, or her membranes rupture before the planned date, the picture changes. Once labour is established or the waters have broken, the usual risk-based or culture-based decision applies, and intrapartum antibiotics begin as normal. The surgical antibiotic at the start of the caesarean is then given on top, adjusted so the same drug is not double-dosed.

If a caesarean is unplanned and happens after hours of labour, the prophylaxis question is the same as for a vaginal delivery — driven by labour onset, ruptured membranes and risk factors, not by the eventual route of birth. Have this conversation ahead of time so the plan is not assembled in the labour room. If you are weighing a vaginal birth after a previous caesarean, fold the GBS question into that discussion too.

• Fever above 38°C, or an unusually low temperature below 36°C, in the first week of life — both can be early signs of serious infection and need same-day medical review. (See what is normal for a newborn's temperature.)
• Unusual lethargy or being hard to wake for feeds. A healthy newborn wakes every two to three hours; a baby sleeping through feeds or hard to rouse needs urgent review.
• Poor feeding or refusing the breast or bottle, especially alongside any other sign on this list.
• Fast breathing above 60 breaths a minute, grunting with each breath, flaring nostrils, or visible pulling-in of the chest between the ribs.
• A baby that is floppy and limp when picked up, or conversely stiff or arching backward, or that has a seizure or twitching movements.
• Any bluish or unusually pale colour around the lips, face or fingertips, especially with fast breathing or poor feeding — call the ambulance on 108 or the maternal-child health line 102 and go to a hospital immediately. Do not wait for the next outpatient appointment.

• Did you check my GBS status with a vaginal and rectal swab? If not, can we arrange the test now at 35–37 weeks?
• If I am positive, will I get intravenous penicillin in labour, and roughly how many doses are needed before delivery for full protection?
• If no swab is done and you are using the risk-based protocol, which of the five risk factors would trigger antibiotics for me?
• I have a penicillin allergy — what is the backup antibiotic plan, and is sensitivity testing done on local GBS strains?
• If I am booked for a planned caesarean, what happens if I go into labour first or my waters break before the date?
• What is the hospital's policy on newborn observation in the first 48–72 hours after a GBS-exposed birth, and what discharge advice will I get?
• Roughly how much does the GBS swab cost here, and is it included in my antenatal package or billed separately?

GBS in pregnancy is a small but real problem with a well-defined solution. The bacterium is harmless to you and lives quietly in about one in seven to one in three pregnant women across India. It only matters at the moment of birth, and intravenous antibiotics in labour cut that risk by roughly 90–95%. The catch is that India does not do universal screening, so the swab is either requested by you in a private hospital or skipped in favour of FOGSI's risk-factor-based protocol.

Practically, the conversation usually has to start with you. Ask your obstetrician at 35–37 weeks whether the swab can be done; if the answer is no or unaffordable, ask which of the five risk factors would trigger antibiotics anyway. Brief whoever will be with you in the labour room so the question can be raised again if you are in no state to negotiate. Pack the relevant notes in your hospital bag, and learn the first-week newborn danger signs so an early infection is caught fast. For building the support around you to do all this, your village of partner, family and community health worker is the foundation.

If a reasonable question about GBS, the swab or the antibiotic is ever brushed off — particularly where cost or convenience seems to be driving the answer more than evidence — the wider pattern in what to do when doctors don't listen is worth reading, and a second opinion is always reasonable.

• ACOG Committee Opinion 797: Prevention of Group B Streptococcal Early-Onset Disease in Newborns
• CDC — Group B Strep (GBS): Information for Clinicians and Pregnancy
• NHS — Group B Strep in Pregnancy
• World Health Organization — Group B Streptococcus (GBS) Fact Sheet and Vaccine Position
• RCOG Green-top Guideline No. 36: Prevention of Early-onset Neonatal Group B Streptococcal Disease