Neonatal case of late-onset sepsis involving group B Streptococcus type Ib

Area of Science:

• Neonatal Medicine
• Infectious Diseases
• Microbiology

Background:

• Group B Streptococcus (GBS) is a leading cause of neonatal sepsis and meningitis.
• Early-onset GBS infections are more common than late-onset infections.
• Type III GBS strains are frequently implicated in neonatal infections, whereas type Ib GBS is rare.

Observation:

• A premature female neonate (27 weeks gestation, 574g) developed respiratory distress syndrome and received ampicillin.
• At 54 days, the infant presented with sepsis, characterized by tachycardia, refractory apnea, bradycardia, and pallor.
• Despite intensive treatment including intubation and catecholamines, the infant died within 5 hours of sepsis onset.

Findings:

• This case details a rare late-onset neonatal infection caused by type Ib GBS.
• The patient succumbed to sepsis despite aggressive medical intervention.
• Type Ib GBS infection may be more prevalent in Japanese infants due to lower maternal IgG antibody concentrations.

Implications:

• Highlights the potential severity of rare GBS serotypes in neonatal sepsis.
• Suggests a possible link between maternal IgG antibody levels and GBS infection susceptibility in Japanese infants.
• Emphasizes the importance of considering diverse GBS strains in the differential diagnosis of late-onset neonatal sepsis.