Abstract
Antagonism between fosfomycin and antipseudomonal penicillins, cefotaxime, and ceftriaxone was observed in Pseudomonas aeruginosa RYC212. Fosfomycin, a non-beta-lactam antibiotic that acts on bacterial cell wall synthesis, decreased the expression of penicillin-binding protein 3 and induced beta-lactamase. The antagonistic effect was reduced in the presence of high concentrations of the beta-lactamase inhibitor tazobactam or in fosfomycin-resistant mutants. We suggest that products resulting from fosfomycin cell wall damage could interact with a system that regulates penicillin-binding protein and beta-lactamase production.
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