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Group B Streptococcal (GBS) Infection

What is Group B streptococcal infection?

Group B streptococcus (Streptococcus agalactiae) is a type of bacteria that normally lives in the gastrointestinal and genitourinary tracts of healthy adults. When it spreads from its usual location to other parts of the body, it can cause a Group B streptococcal infection. This infection is most commonly discussed in relation to newborns, pregnant women, and adults with certain medical conditions, but it can affect anyone.

In newborns, GBS is a leading cause of early‑onset sepsis, meningitis, and pneumonia. In adults, particularly the elderly or those with chronic illnesses, it may lead to bloodstream infections, skin and soft‑tissue infections, urinary tract infections (UTIs), and invasive diseases such as endocarditis. Prompt recognition and treatment are crucial because invasive GBS can progress rapidly and become life‑threatening.

Sources: CDC, Mayo Clinic, WHO.

Common Causes

GBS infection usually arises when the bacteria move from a site where they normally colonise to a sterile area of the body. The following conditions increase the risk of this migration:

• Pregnancy – GBS colonisation of the vagina or rectum can be passed to the baby during labor.
• Premature rupture of membranes (PROM) – prolonged exposure of the fetus to GBS in the birth canal.
• Maternal fever or chorioamnionitis – inflammation of the fetal membranes facilitates bacterial transfer.
• Diabetes mellitus – impaired immune response makes it easier for GBS to invade.
• Chronic kidney disease or dialysis – provides a portal for bacteria to enter the bloodstream.
• Immunosuppression (e.g., HIV, chemotherapy, steroids) – reduces the body’s ability to contain the bacteria.
• Advanced age – immune senescence increases susceptibility to invasive disease.
• Recent surgery or invasive procedures – catheters, endotracheal tubes, or wound dressings can serve as entry points.
• Skin breakdown or chronic wounds – especially in patients with peripheral vascular disease.
• Urinary catheterisation – provides a conduit for GBS to ascend into the bladder and kidneys.

Associated Symptoms

Symptoms vary by age group and the organ system involved. Below is a summary of the most frequently reported manifestations:

Newborns (Early‑onset, < 24 hours)

• Fever or low body temperature
• Difficulty feeding, poor suck
• Lethargy or irritability
• Rapid breathing or apnea
• Skin rash or mottled appearance
• Seizures (in severe cases)

Infants (Late‑onset, 7‑90 days)

• Fever, sometimes with a “cold” feeling
• Vomiting or poor feeding
• Jaundice or irritability
• Signs of meningitis: bulging fontanelle, stiff neck

Adults

• Fever and chills
• Chills with rigors
• Painful swelling of skin, especially around the groin, abdomen, or surgical sites
• Urinary symptoms: dysuria, urgency, flank pain (if UTI)
• Shortness of breath or chest pain (if pneumonia or endocarditis)
• Generalised fatigue, malaise

When to See a Doctor

Because GBS can become invasive very quickly, seek medical attention if you notice any of the following:

• Fever ≥ 38°C (100.4°F) in a newborn or infant, especially with poor feeding or breathing difficulties.
• Sudden onset of a painful, red, or swollen skin lesion that expands rapidly.
• Unexplained chills, rigors, or a rapid heart rate (tachycardia) in an adult.
• Difficulty breathing, chest pain, or new cough with fever.
• Severe headache, neck stiffness, or changes in mental status—possible meningitis.
• Urinary symptoms accompanied by fever, flank pain, or blood in the urine.
• Any pregnant woman who tests positive for GBS colonisation should discuss intrapartum antibiotic prophylaxis with her obstetrician.

When in doubt, especially with newborns, call your pediatrician or go to the nearest emergency department.

Diagnosis

Diagnosis relies on a combination of clinical assessment and laboratory testing. The specific approach differs between pregnant women, newborns, and non‑pregnant adults.

Pregnant Women

• Routine Vaginal‑Rectal Swab at 35‑37 weeks gestation. A positive culture indicates colonisation.
• If a woman has a prior GBS‑positive infant, repeat testing is recommended.

Newborns

• Blood cultures – gold standard for detecting bacteremia.
• Lumbar puncture – performed if meningitis is suspected; cerebrospinal fluid (CSF) examined for bacteria, white‑cell count, and glucose.
• Chest X‑ray – to assess for pneumonia.

Adults

• Blood culture – essential for suspected sepsis or endocarditis.
• Urine culture – if urinary symptoms are present.
• Wound or skin swab – for cellulitis or abscesses.
• Echocardiography – indicated when endocarditis is a concern.

Laboratory reporting includes susceptibility testing, which guides antibiotic choice. Molecular methods (e.g., PCR) are increasingly used for rapid detection, especially in the obstetric setting.

Treatment Options

Treatment is dictated by the site and severity of infection, as well as patient age and comorbidities.

Antibiotic Therapy

• Penicillin G – first‑line for most invasive GBS infections; given intravenously.
• Ampicillin – an alternative, especially in neonates.
• Gentamicin – often added for synergistic effect in severe neonatal sepsis.
• Erythromycin or Clindamycin – used when patients have a true penicillin allergy, provided the isolate is susceptible.
• Vancomycin – reserved for multidrug‑resistant strains or when susceptibility is unknown.

Supportive Care

• Intravenous fluids to maintain blood pressure.
• Oxygen therapy or mechanical ventilation for respiratory compromise.
• Antipyretics (e.g., acetaminophen) for fever control.
• Analgesics for pain associated with cellulitis or joint involvement.

Specific Situations

• Intrapartum Antibiotic Prophylaxis (IAP) – For GBS‑positive pregnant women, a single dose of Penicillin G (or ampicillin) is administered at the onset of labor to prevent neonatal transmission.
• Abscess Drainage – Surgical or percutaneous drainage may be needed for large skin or soft‑tissue collections.
• Endocarditis – Requires prolonged IV antibiotics (typically 4–6 weeks) and cardiology follow‑up.

Home Care After Hospital Discharge

• Complete the full prescribed antibiotic course, even if you feel better.
• Maintain good wound hygiene; change dressings as instructed.
• Stay hydrated and rest to aid immune recovery.
• Monitor temperature twice daily for at least a week.
• Schedule a follow‑up appointment with your primary care provider or obstetrician.

Prevention Tips

• Screen Pregnant Women for GBS colonisation at 35‑37 weeks gestation; follow obstetric guidelines for IAP.
• Good Hand Hygiene – Wash hands with soap and water before handling newborns or after using the bathroom.
• Avoid Unnecessary Catheterisation – For both urinary and intravenous lines; if required, ensure strict aseptic technique.
• Prompt Treatment of Skin Breaks – Clean and cover cuts, abrasions, or surgical wounds.
• Vaccination – While no vaccine exists for GBS yet, staying up‑to‑date on influenza and pneumococcal vaccines reduces overall infection risk.
• Manage Chronic Illnesses – Keep diabetes, kidney disease, and other conditions well‑controlled to support immune function.
• Antibiotic Stewardship – Use antibiotics only when prescribed; overuse can promote resistant GBS strains.

Emergency Warning Signs

Key Take‑aways

• GBS is a common coloniser that can become invasive, especially in newborns, pregnant women, the elderly, and immunocompromised individuals.
• Early identification—through routine screening in pregnancy and prompt evaluation of fever or serious symptoms—greatly improves outcomes.
• Treatment with penicillin‑based antibiotics is highly effective; resistance is rare but must be considered in penicillin‑allergic patients.
• Prevention focuses on screening, hygiene, proper wound care, and managing underlying health conditions.

For personalized advice or if you suspect a GBS infection, contact your healthcare provider promptly. Timely intervention can prevent serious complications and save lives.

References:

1. Mayo Clinic. Group B Strep infection. https://www.mayoclinic.org
2. Centers for Disease Control and Prevention. Prevention of Perinatal Group B Streptococcal Disease. https://www.cdc.gov
3. World Health Organization. Group B Streptococcus (GBS). https://www.who.int
4. National Institutes of Health – National Library of Medicine. Streptococcus agalactiae infection. PubMed
5. Cleveland Clinic. Group B Strep in Pregnancy. https://my.clevelandclinic.org

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