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[Haemophilus influenzae bacterial meningitis: residual risk; case report]
Unlabelled:
Bacterial meningitis due to Haemophilus influenzae has become a rare, albeit not exceptional occurrence since generalized vaccination against that pathogen was instated, concerning as well incapsulated b and non-b Haemophilus influenzae strains, as non-incapsulated strains.
Case Report:
A 19-month-old fully immunized infant was referred to our hospital for bacterial meningitis. CSF analysis elicited biotype III, non-incapsulated Haemophilus influenzae.
Conclusion:
Generalizing Haemophilus influenzae preventive inoculation has revolutionized the epidemiology of bacterial meningitis; however, a residual risk exists, which deserves to be taken into account.
Insights
Despite widespread vaccination, bacterial meningitis caused by Haemophilus influenzae remains a rare but possible threat. Non-encapsulated strains pose a residual risk, necessitating continued vigilance.
Area of Science:
- Pediatric infectious diseases
- Bacteriology
- Vaccinology
Background:
- Haemophilus influenzae (Hi) historically caused significant bacterial meningitis in children.
- Widespread vaccination has dramatically reduced Hi meningitis incidence.
- Vaccination targets encapsulated strains, but non-encapsulated strains also exist.
Observation:
- A 19-month-old infant, fully immunized, presented with bacterial meningitis.
- Cerebrospinal fluid analysis identified a non-encapsulated strain of Haemophilus influenzae (biotype III).
- This case highlights infections beyond the scope of current vaccine targets.
Findings:
- Bacterial meningitis due to Haemophilus influenzae, though rare, can still occur in vaccinated individuals.
- Non-encapsulated Haemophilus influenzae strains represent a persistent etiological agent.
- The epidemiology of bacterial meningitis has been altered but not eliminated by vaccination.
Implications:
- Preventive inoculation strategies for Haemophilus influenzae have revolutionized meningitis control.
- A residual risk of bacterial meningitis persists, even in fully immunized populations.
- Surveillance and awareness of non-encapsulated strains are crucial for public health.