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Otitis media caused by non-typable, ampicillin-resistant strains of Haemophilus influenzae
Abstract:
Strains of Haemophilus influenzae, which did not belong to any of the known capsular serotypes and which were resistant in vitro to ampicillin, have been isolated from middle ear exudates of two children with otitis media. These children failed to improve with ampicillin therapy, and the resistant organisms persisted at the site of infection. Patients infected with such ampicillin-resistant organisms require therapy with antimicrobial agents which are not susceptible to degradation by penicillinase.
Insights
Ampicillin-resistant Haemophilus influenzae strains were found in children with otitis media. These non-typable, resistant bacteria persisted despite ampicillin treatment, indicating a need for alternative therapies.
Area of Science:
- Microbiology
- Infectious Diseases
- Otitis Media Pathogenesis
Background:
- Otitis media is a common childhood infection.
- Haemophilus influenzae is a frequent pathogen in otitis media.
- Ampicillin resistance in bacteria poses a therapeutic challenge.
Observation:
- Two children with otitis media presented with non-typable Haemophilus influenzae strains.
- These isolates exhibited in vitro resistance to ampicillin.
- The resistant bacteria persisted in the middle ear exudates.
Findings:
- The isolated Haemophilus influenzae strains were ampicillin-resistant and non-typable.
- Ampicillin therapy was ineffective in clearing the infection.
- Persistent ampicillin-resistant organisms were detected at the infection site.
Implications:
- Non-typable, ampicillin-resistant Haemophilus influenzae may cause persistent otitis media.
- Treatment failure with ampicillin highlights the need for alternative antimicrobial agents.
- Antimicrobial agents not degraded by penicillinase are required for effective treatment.