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Bactericidal activity of oxacillin against beta-lactamase-hyperproducing Staphylococcus aureus
1Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha 68105.
Antimicrobial Agents and Chemotherapy
|November 1, 1988
Summary
Oxacillin
Area of Science:
- Microbiology
- Pharmacology
Background:
- Staphylococcus aureus strains producing beta-lactamase pose treatment challenges.
- Oxacillin's efficacy against these strains requires careful evaluation.
Purpose of the Study:
- To assess the bactericidal activity of oxacillin against beta-lactamase-hyperproducing Staphylococcus aureus.
- To compare the influence of different testing conditions on oxacillin's bactericidal activity.
Main Methods:
- Minimum Bactericidal Concentration (MBC) studies and kill kinetics were performed.
- Tests utilized Mueller-Hinton broth (MHB) with and without 2% NaCl supplementation.
- Incubation occurred at 30 and 35 degrees C.
Main Results:
- Salt supplementation significantly increased the oxacillin MBC/MIC ratio in MBC testing.
- Kill kinetics studies showed oxacillin to be more bactericidal than MBC testing.
- Salt supplementation had a less dramatic effect on kill kinetics results compared to MBC testing.
Conclusions:
- Bactericidal testing results are significantly influenced by the methodology used.
- Further in vivo studies are essential to fully determine oxacillin's effectiveness against these resistant S. aureus strains.