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[Estimation of antibacterial activity of various antibiotics against Pseudomonas aeruginosa by score method]
M Kouda1, J Fukuhara, M Takeuchi
1First Division of Clinical Laboratories, Tokyo Metropolitan Police Hospital.
Abstract:
Antibacterial activity of various antibiotics against Pseudomonas aeruginosa isolated from each hospitals depends on the variety or amount of antibiotics used in each hospital. The antibiotic, which is effective to P. aeruginosa in a certain hospital is not always effective to that in other hospital. The excellent antibiotics in antibacterial activity have low MIC and hard to progress in resistance, and such antibiotics may be effective against P. aeruginosa isolated from any hospitals. Therefore we thought that the antibiotic, which was progress to resistance, would show a great difference in MIC among hospitals, and we investigated MIC and difference of MIC of various antibiotics against P. aeruginosa isolated from six hospitals. Furthermore, we converted the data of MICs and difference of MIC among six hospitals into the score, and tried to estimate antibacterial activity of various antibiotics by using those scores. From the results of analysis in this report, we think the antibiotics actually surpass in antibacterial activity may be imipenem, cefozopran, cefsulodin and amikacin. New analytical method proposed in this report will become one of potential methods to estimate antibacterial activity of antibiotics against bacteria isolated from inpatient with bacterial infections.
Insights
Antibiotic effectiveness against Pseudomonas aeruginosa varies by hospital. Excellent antibiotics like imipenem show consistent low minimum inhibitory concentrations (MIC), suggesting broad efficacy against resistant strains.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Antibiotic resistance in Pseudomonas aeruginosa is a growing concern.
- The efficacy of antibiotics against P. aeruginosa varies significantly between healthcare settings.
- Hospital-specific antibiotic usage patterns influence bacterial susceptibility.
Purpose of the Study:
- To evaluate the antibacterial activity of various antibiotics against P. aeruginosa strains from different hospitals.
- To investigate the relationship between antibiotic resistance, minimum inhibitory concentration (MIC), and hospital-specific efficacy.
- To develop a scoring system for estimating antibiotic effectiveness.
Main Methods:
- Isolation of P. aeruginosa from six hospitals.
- Determination of MIC values for various antibiotics against isolated strains.
- Analysis of MIC variations across hospitals.
- Development of a scoring system based on MIC and MIC differences.
Main Results:
- Significant variations in antibiotic efficacy against P. aeruginosa were observed among hospitals.
- Antibiotics with low MIC and resistance to progression, such as imipenem, cefozopran, cefsulodin, and amikacin, demonstrated superior activity.
- The proposed scoring method effectively estimated antibacterial activity.
Conclusions:
- Antibiotic effectiveness against P. aeruginosa is hospital-dependent.
- Imipenem, cefozopran, cefsulodin, and amikacin are highly effective antibiotics.
- The novel analytical method provides a potential tool for assessing antibiotic activity in clinical settings.