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Optochin resistance in Streptococcus pneumoniae strains isolated from blood and middle ear fluid
1Department of Microbiology, Aurora Hospital, Helsinki, Finland.
Abstract:
Optochin resistant Streptococcus pneumoniae having typical pneumococcal morphology in culture and Gram stain and giving clear agglutination with anti-pneumococcal polysaccharide antisera were isolated from primary cultures of blood and middle ear fluid. The isolated pneumococci were either fully sensitive to penicillin and other antimicrobial agents commonly used or relatively resistant to penicillin and resistant to cloxacillin, tetracycline, erythromycin, sulphatrimethoprim and clindamycin.
Insights
Optochin resistant Streptococcus pneumoniae strains were identified in blood and middle ear fluid cultures. These resistant pneumococci exhibited varying sensitivities to common antibiotics, including penicillin, cloxacillin, and erythromycin.
Area of Science:
- Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Background:
- Streptococcus pneumoniae is a leading cause of bacterial infections worldwide.
- Antimicrobial resistance in S. pneumoniae poses a significant public health challenge.
- Understanding resistance patterns is crucial for effective treatment strategies.
Observation:
- Isolation of Streptococcus pneumoniae from blood and middle ear fluid cultures.
- Identified pneumococci displayed typical morphology and positive agglutination with specific antisera.
- Some isolates showed resistance to multiple commonly used antibiotics.
Findings:
- Optochin resistance was observed in the isolated Streptococcus pneumoniae strains.
- The pneumococci exhibited varied susceptibility profiles, including penicillin resistance.
- Resistance was noted against cloxacillin, tetracycline, erythromycin, sulphatrimethoprim, and clindamycin in some isolates.
Implications:
- The emergence of optochin-resistant S. pneumoniae necessitates careful antibiotic selection.
- These findings highlight the need for ongoing surveillance of antimicrobial resistance patterns.
- Clinical management of pneumococcal infections may require alternative therapeutic approaches.