Plasmid-mediated quinolone resistance in Escherichia coli strains isolated from food animals

VernacularTitle:养殖动物分离的大肠埃希菌质粒介导喹诺酮耐药机制的研究
Author: Yunpeng WANG ; Shenghui CUI ; Jingyun LI ; Changqin HU ; Shaohong JIN ; Yue MA
Publication Type:Journal Article
Keywords: Escherichia coli; Plasmid-mediated resistance; qnr genes; Quinolone-resistance
From: Chinese Journal of Microbiology and Immunology 2010;30(5):477-482
CountryChina
Language:Chinese
Abstract: Objective To study on plasmid-mediated quinolone-resistant in Escherichia coli strains isolated from fecal samples of chicken and swine from the nine farms around our country.Methods Antimi-crobial susceptibility testing was carried out by broth microdilution testing,gyrA,gyrB,parC,qnr and aac (6')- Ⅰ b-cr were examined by PCR,and the products were sequenced.Conjugation experiment was carried out to proved that the plasmid-mediated quinolone resistance was transferable.Results In the total 818 animal isolates,qnr and aac genes were detected in 38 (4.6%) and 75 (9.2%) strains.The qnrA,qnrB,and qnrS genes were detected in 1 (0.1%),9 (1.1%) and 28 (3.4%) of the isolates.All isolates were negative for qnrC,qnrD genes.Conclusion There is a close relationship between high level quinolone resistance and plasmid-mediated quinolone resistance.The results of the current study highlight food-producing animals as a potential reservoir of antimicrobial-resistant bacteria and clinically important resistance genes.More attention should be paid to the surveillance of such strains.