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Assessing Respiratory Immune Responses to Haemophilus Influenzae
06:32

Assessing Respiratory Immune Responses to Haemophilus Influenzae

Published on: June 29, 2021

[Non-typable Haemophilus influenzae severe pneumonia in an infant: case report]

Luis E Vega-Briceño1, Cecilia Perret, Nils Holmgren

  • 1Programa de Enfermedades Respiratorias del Niño, Departamento de Pediatría, Pontificia Universidad Católica de Chile, Santiago.

Revista Chilena De Infectologia : Organo Oficial De La Sociedad Chilena De Infectologia
|March 31, 2005
PubMed

Insights

Haemophilus influenzae type b (Hib) conjugate vaccines have reduced Hib pneumonia. However, non-b H. influenzae strains are now a significant cause of pediatric pneumonia, even in vaccinated children.

Area of Science:

  • Pediatric infectious diseases
  • Vaccinology
  • Microbiology

Background:

  • Haemophilus influenzae type b (Hib) was a leading cause of childhood pneumonia before widespread vaccination.
  • Hib conjugate vaccines have dramatically reduced the incidence of Hib disease.

Observation:

  • A case of severe pneumonia with empyema and bacteremia in an infant who completed the Hib vaccination schedule is presented.
  • Non-typeable H. influenzae (NTHi) was identified as the causative agent from blood and pleural fluid cultures.

Findings:

  • This case highlights that non-b H. influenzae can cause severe pneumonia in fully vaccinated children.
  • NTHi emerged as a significant pathogen despite successful Hib vaccination programs.

Implications:

  • There is a need to consider non-typeable H. influenzae in the differential diagnosis of pediatric pneumonia, especially in vaccinated populations.
  • This underscores the importance of ongoing surveillance and potential development of broader vaccines against non-typeable H. influenzae strains.

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