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Penicillin-insensitive pneumococci. Case report and review
Abstract:
Infections due to pneumococci with decreased susceptibility (or resistance) to penicillin have been infrequently recognized. Our experience and that of others suggest that (1) penicillin susceptibility testing of significant pneumococcal isolates should become routine; (2) penicillin may not be adequate therapy for CNS infections due to pneumococci whose penicillin minimal inhibitory concentration is greater than 0.1 microgram/ml; and (3) long-term penicillin "prophylaxis" may be inappropriate in the splenectomized patient in areas where these organisms are prevalent.
Insights
Routine penicillin susceptibility testing is crucial for pneumococcal infections. Penicillin may be inadequate for central nervous system infections and long-term prophylaxis in asplenic patients due to increasing resistance.
Area of Science:
- Microbiology
- Infectious Diseases
- Clinical Medicine
Background:
- Infections caused by Streptococcus pneumoniae (pneumococci) with reduced penicillin susceptibility are increasingly recognized.
- Understanding pneumococcal resistance patterns is vital for effective treatment strategies.
Observation:
- Infections caused by pneumococci with decreased penicillin susceptibility are infrequently reported.
- Clinical experience suggests a need for reassessment of penicillin's role in treating certain pneumococcal infections.
Findings:
- Penicillin susceptibility testing for significant pneumococcal isolates should be standardized.
- Penicillin may be insufficient for treating central nervous system (CNS) infections caused by pneumococci with a minimal inhibitory concentration (MIC) > 0.1 microgram/ml.
- Long-term penicillin prophylaxis might be unsuitable for asplenic individuals in regions with prevalent resistant pneumococci.
Implications:
- This highlights the importance of updated clinical guidelines for pneumococcal infection management.
- Clinicians should consider alternative antibiotics for CNS infections and prophylaxis in at-risk populations.
- Enhanced surveillance of pneumococcal penicillin resistance is necessary to guide public health interventions.