Combination effect of levofloxacin and cefmenoxime against ocular isolates of Pseudomonas aeruginosa.

Autor: Itoi M; School of Optometry and Vision Science, Faculty of Science, The University of New South Wales, Sydney, New South Wales, Australia; Dougenzaka Itoi Eye Clinic, Itoi building 1-10-19 Dougenzaka Shibuya-ku, Tokyo, Japan. Electronic address: m.itoi@unsw.edu.au., Willcox MDP; School of Optometry and Vision Science, Faculty of Science, The University of New South Wales, Sydney, New South Wales, Australia. Electronic address: m.willcox@unsw.edu.au.
Jazyk: angličtina
Zdroj: Contact lens & anterior eye : the journal of the British Contact Lens Association [Cont Lens Anterior Eye] 2024 Dec; Vol. 47 (6), pp. 102311. Date of Electronic Publication: 2024 Sep 20.
DOI: 10.1016/j.clae.2024.102311
Abstrakt: Purpose: This study aimed to investigate the effects of the combination of levofloxacin (LVFX) and cefmenoxime (CMX) on ocular isolates of Pseudomonas aeruginosa.
Methods: Twenty-three strains of P. aeruginosa isolated from microbial keratitis cases in Australia were utilized in this study. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of each antibiotic alone were determined and the combined susceptibility of antibiotics was assessed through fractional inhibitory concentration index (FICI). Additionally, tolerance of a ciprofloxacin tolerant P. aeruginosa isolate to each antibiotic alone and combination were analyzed.
Results: The median MIC and MBC values of CMX against P. aeruginosa were 16 µg/mL and 32 µg/mL, respectively. The median MIC and MBC values of LVFX were 0.5 µg/mL and 1 µg/mL, respectively, and all isolates were susceptible. In dual combination, the median of FICI of all strains was 0.63; seven strains showed synergistic effects (FICI≤0.5), and fifteen strains showed additive activities, while no strains exhibited antagonism. The isolate of P. aeruginosa that had previously exhibited tolerance to ciprofloxacin showed high tolerance to CMX alone and low tolerance to LVFX alone. This strain showed low tolerance to the combination of CMX and LVFX.
Conclusion: The combination of LVFX with CMX may have beneficial interactions which increase antibacterial activity against P. aeruginosa isolates and may be a feasible option for addressing the issue of bacteria resistant to each antibiotic.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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