The objective of this study was to verify the supposition that efflux might be involved in the drug resistance of Riemerella anatipestifer isolates. Two broad-spectrum effiux pump inhibitors, carbonyl cyanide 3-chlorophenylhydrazone （CCCP） and Phe-Arg-β-naphthylamide （PAL3N）, on the contribution of minimum inhibitory concentrations of amikacin, streptomycin, chloramphenicol, tetracycline, ceftdaxone, ceftazidime, nalidixic acid, levofloxacin, enrofloxacin, as well as ciprofloxacin against 69 clinical R. anatipestifer isolates were investigated. We first reported that the two efflux pump inhibitors could restore the antimicrobial susceptibility of R. anatipestiferisolates. It is suggested that active efflux system is possible to be linked with the development of resistance in R. anatipestifer isolates.
LI Ya-feiJIANG Hong-xiaXIANG RongSUN NaZHANG Ya-nanZHAO Li-qingGU PengWANG Li-qiaoZENG Zhen-ling
