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Updated: Aug 11, 2026

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
Published on: September 25, 2014
A penicillin-resistant Streptococcus pneumoniae; case report
Abstract:
A strain of Streptococcus pneumoniae has been isolated from a five-month-old child with persistent otitis media. The minimum inhibitory concentration (MIC) detected was 4 micrograms/ml penicillin. This strain was possibly selected out by inadequate penicillin V therapy.
Insights
A penicillin-resistant Streptococcus pneumoniae strain was found in an infant with persistent otitis media. Inadequate penicillin V therapy may have led to this resistant bacterial strain.
Area of Science:
- Microbiology
- Pediatrics
- Infectious Diseases
Background:
- Otitis media is a common childhood infection.
- Streptococcus pneumoniae is a frequent causative agent of otitis media.
- Antibiotic resistance is a growing concern in treating bacterial infections.
Observation:
- A five-month-old infant presented with persistent otitis media.
- A specific strain of Streptococcus pneumoniae was isolated from the infant.
- The isolated strain exhibited a minimum inhibitory concentration (MIC) of 4 µg/ml for penicillin.
Findings:
- The Streptococcus pneumoniae strain demonstrated resistance to penicillin.
- The penicillin MIC suggests that standard penicillin V therapy may be insufficient.
- The resistance may have been selected by prior inadequate penicillin V treatment.
Implications:
- This case highlights the emergence of penicillin resistance in Streptococcus pneumoniae.
- Inadequate antibiotic therapy can contribute to the selection of resistant strains.
- Further research is needed to understand and manage antibiotic resistance in pediatric infections.
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