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[Antimicrobial activity of piperacillin in vitro]
Abstract:
There was an increase in the resistance of clinical isolates to piperacillin as compared to that in 1987-1988. It was shown on the kinetic models that there was difference in the effect of the inhibitory and subinhibitory concentrations of the drug on microorganisms in various growth phases. No post-antibiotic action against Staphylococcus aureus and Pseudomonas aeruginosa and a slightly pronounced dose-dependent effect with respect to Escherichia coli were noted.
Insights
Clinical bacterial resistance to piperacillin has increased since 1987-1988. Drug concentrations impact bacterial growth differently, with minimal post-antibiotic effects observed against key pathogens like Staphylococcus aureus and Pseudomonas aeruginosa.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Clinical isolates show increased resistance to piperacillin compared to 1987-1988 levels.
- Understanding drug concentration effects on bacterial growth phases is crucial for effective antibiotic therapy.
Purpose of the Study:
- To investigate the evolving resistance patterns of clinical bacterial isolates to piperacillin.
- To analyze the impact of inhibitory and subinhibitory piperacillin concentrations on bacterial growth kinetics across different growth phases.
Main Methods:
- Kinetic modeling was employed to study the effects of piperacillin concentrations.
- Bacterial isolates were assessed for resistance levels and growth dynamics.
Main Results:
- A notable increase in piperacillin resistance among clinical isolates was observed.
- Kinetic models revealed differential effects of drug concentrations on bacteria in various growth phases.
- Minimal post-antibiotic effect was detected against Staphylococcus aureus and Pseudomonas aeruginosa.
- A slight dose-dependent effect was observed with Escherichia coli.
Conclusions:
- Piperacillin resistance in clinical settings has risen, necessitating ongoing surveillance.
- Bacterial growth phase significantly influences the efficacy of piperacillin, impacting treatment strategies.
- The limited post-antibiotic effect suggests potential for rapid regrowth of certain pathogens.