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A problem with the recognition of penicillin-resistant pneumococci
Journal of Clinical Pathology
|November 1, 1980
Summary
A penicillin-resistant Streptococcus pneumoniae strain was discovered in a child with no prior antibiotic exposure. This finding highlights the potential for spontaneous development of antibiotic resistance in common bacteria.
Area of Science:
- Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Background:
- Streptococcus pneumoniae is a common bacterium causing various infections.
- Penicillin has been a primary treatment for pneumococcal infections.
- The emergence of antibiotic resistance is a significant global health concern.
Observation:
- A strain of Streptococcus pneumoniae was isolated from a child's antrum.
- The child had no history of foreign travel or previous penicillin treatment.
- Initial penicillin susceptibility testing was inadvertently performed with an under-strength disc.
Findings:
- The isolated Streptococcus pneumoniae strain demonstrated resistance to penicillin, requiring 0.25 mg/L for growth inhibition.
- Confirmation with a standard 2-unit penicillin disc showed minimal inhibition zone, confirming resistance.
- This resistance was identified incidentally due to a faulty testing disc.
Implications:
- This case suggests that penicillin resistance in Streptococcus pneumoniae can arise spontaneously, even without apparent selective pressure.
- Early detection of resistance is crucial for effective treatment strategies.
- Further research is needed to understand the mechanisms and prevalence of such resistance in pediatric populations.