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Effect of temperature on antimicrobial susceptibilities of Pseudomonas maltophilia
Abstract:
After a case of peritonitis caused by Pseudomonas maltophilia had occurred 20 strains of the organism were investigated and the minimum inhibitory concentrations of a variety of antibiotics determined at 30 degrees C and 37 degrees C. There was a significant difference in susceptibility between 30 degrees C (most resistant) and 37 degrees C (most susceptible) for aminoglycosides and polymyxin B. No difference was seen with the other agents or in strains of Ps aeruginosa and Enterobacteriaceae tested under similar conditions. The possible mechanisms of this phenomenon are discussed below.
Insights
Pseudomonas maltophilia shows increased resistance to certain antibiotics at lower temperatures. This study found significant differences in minimum inhibitory concentrations between 30°C and 37°C for key drugs.
Area of Science:
- Clinical Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Peritonitis is a serious infection, and Pseudomonas maltophilia is a potential causative agent.
- Understanding antibiotic susceptibility is crucial for effective treatment of bacterial infections.
Observation:
- Twenty strains of Pseudomonas maltophilia were analyzed following a peritonitis case.
- Minimum inhibitory concentrations (MICs) of various antibiotics were determined at two different temperatures: 30°C and 37°C.
Findings:
- A significant difference in antibiotic susceptibility was observed between 30°C and 37°C.
- Pseudomonas maltophilia exhibited increased resistance at 30°C compared to 37°C for aminoglycosides and polymyxin B.
- No temperature-dependent susceptibility differences were noted for other tested antibiotics or for Pseudomonas aeruginosa and Enterobacteriaceae strains.
Implications:
- The findings suggest that incubation temperature can significantly impact the in vitro assessment of Pseudomonas maltophilia antibiotic susceptibility.
- This phenomenon may have implications for clinical treatment strategies and laboratory testing protocols.
- Further research into the underlying mechanisms of temperature-dependent resistance is warranted.