Invasive Streptococcus Gallolyticus Infections in Infants At Texas Children's Hospital: A 9-Year Retrospective Review

Marisa Orbea1, Nilesh Desai2, Catherine Foster1

  • 1From the Department of Pediatrics, Division of Infectious Diseases, Baylor College of Medicine and Texas Children's Hospital.

Insights

Streptococcus gallolyticus subsp. pasteurianus can cause serious infections like sepsis and meningitis in infants. Early treatment led to favorable outcomes, but some strains showed penicillin resistance, underscoring the need for susceptibility testing.

Area of Science:

  • Pediatric Infectious Diseases
  • Neonatal Microbiology
  • Bacterial Pathogenesis

Background:

  • Streptococcus gallolyticus subsp. pasteurianus is an uncommon cause of invasive infections in neonates.
  • Infections can manifest as bacteremia, sepsis, and meningitis, posing significant risks to infants.

Purpose of the Study:

  • To describe the clinical presentation, treatment, and outcomes of infants with S. gallolyticus subsp. pasteurianus infections.
  • To assess the antimicrobial susceptibility patterns of S. gallolyticus subsp. pasteurianus isolates in this pediatric population.

Main Methods:

  • Retrospective case series analysis of 15 infants diagnosed with S. gallolyticus subsp. pasteurianus bacteremia and/or meningitis.
  • Review of clinical data, treatment regimens, neuroimaging results, and antimicrobial susceptibility testing (AST) data.

Main Results:

  • Fifteen infants with S. gallolyticus subsp. pasteurianus infections were identified.
  • Clinical courses were generally favorable, with limited neuroimaging abnormalities observed.
  • A significant proportion (one-third) of isolates exhibited reduced susceptibility to penicillin.

Conclusions:

  • S. gallolyticus subsp. pasteurianus infections in infants, while unusual, can be managed effectively with appropriate antimicrobial therapy.
  • The emergence of reduced penicillin susceptibility highlights the critical need for routine antimicrobial susceptibility testing in managing infant meningitis and sepsis caused by this pathogen.

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