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[Meningitis due to haemophilus influenzae type f]

M González López1, A del Pino De La Fuente, F J García Martín

  • 1Departamento de Pediatría, Hospital Materno Infantil de Málaga, Madrid.

Anales Espanoles De Pediatria
|November 21, 2000
PubMed

Insights

Haemophilus influenzae type f (Hif) caused meningitis in a vaccinated infant, indicating potential vaccine failure. Non-type b Hif serotypes are emerging pathogens in young children.

Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Vaccinology

Background:

  • Haemophilus influenzae type b (Hib) conjugate vaccines (PRP-T) are highly effective in preventing Hib meningitis.
  • Invasive bacterial meningitis remains a significant cause of morbidity and mortality in young children.
  • Non-typeable and non-b serotypes of Haemophilus influenzae can also cause invasive disease.

Observation:

  • A 5-month-old immunocompetent boy presented with meningitis.
  • The patient had received two doses of the Hib conjugate vaccine.
  • Initial Gram stain suggested vaccination failure, but culture identified Haemophilus influenzae type f (Hif).

Findings:

  • The patient's meningitis was caused by Haemophilus influenzae type f (Hif), a non-type b serotype.
  • This case highlights a potential vaccination failure or the emergence of non-b Hif as a pathogen.
  • Non-b Hif serotypes should be considered in invasive diseases in children under 5 years.

Implications:

  • The increasing prevalence of non-b Hif serotypes necessitates enhanced epidemiological surveillance.
  • Current vaccination strategies may need re-evaluation to address non-b Hif strains.
  • Clinicians should consider non-b Hif in the differential diagnosis of meningitis in vaccinated children.

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