Abstract
The CmeABC efflux pump plays an important role in the antimicrobial resistance of Campylobacter jejuni and Campylobacter coli. The aim of this investigation was to study the effect of putative efflux pump inhibitors, phenyl-arginine-beta-naphthylamide (PAbetaN) and 1-(1-naphthylmethyl)-piperazine (NMP), as well as the effect of putative efflux pump inducers, sodium salicylate and sodium deoxycholate, on the MIC levels of erythromycin, ciprofloxacin, kanamycin, tetracycline and rifampicin for C. jejuni and C. coli. Our results indicated that susceptibility to erythromycin and rifampicin increased, respectively, 8- to 32- and 8- to 64-fold in the presence of PAbetaN and to a lesser extent in the presence of NMP. Salicylate produced a 2- to 4-fold increase in ciprofloxacin MIC values, whereas little effect was observed in the presence of deoxycholate.
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