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Haemophilus influenzae meningitis in adults
Abstract:
Three cases of pyogenic Haemophilus influenzae meningitis in adults have been diagnosed within the Brisbane Metropolitan area in the last twelve months. This had been considered a very unusual cause of meningitis in adults which has not previously been recorded in the Australian literature, and should alert clinicians to a possible alteration in the age specificity of this disease. Two of the three isolates proved resistant to ampicillin; this emphasizes the need to exclude beta lactamase production in all Haemophilus isolates from critical infections. All three patients recovered without significant sequelae but the choice of primary antimicrobial in adult meningitis remains open to question.
Insights
Pyogenic Haemophilus influenzae meningitis, rare in adults, was diagnosed in Brisbane. Two of three cases showed ampicillin resistance, highlighting the need for beta-lactamase testing in critical Haemophilus infections.
Area of Science:
- Infectious Diseases
- Bacteriology
- Neurology
Background:
- Haemophilus influenzae meningitis is typically a pediatric disease.
- Adult meningitis cases are less common and often caused by different pathogens.
- Previous Australian literature has not documented adult pyogenic Haemophilus influenzae meningitis.
Observation:
- Three adult cases of pyogenic Haemophilus influenzae meningitis were identified in Brisbane within a 12-month period.
- This incidence is considered unusual for the adult population.
- Two of the three isolates exhibited resistance to ampicillin.
Findings:
- The observed cases suggest a potential shift in the age specificity of Haemophilus influenzae meningitis.
- Ampicillin resistance in two isolates underscores the importance of detecting beta-lactamase production in Haemophilus strains from severe infections.
- All patients achieved full recovery without lasting complications.
Implications:
- Clinicians should consider Haemophilus influenzae as a potential cause of meningitis in adults.
- Antimicrobial susceptibility testing, including beta-lactamase assessment, is crucial for guiding treatment of adult bacterial meningitis.
- The optimal choice of initial antimicrobial therapy for adult meningitis warrants further consideration in light of emerging resistance patterns.