摘要
本研究的目的是通过调查新疆地区分离的牛源产志贺毒素大肠杆菌(STEC)的耐药表型和基因型,掌握STEC耐药性的发展和传播规律。本研究对新疆6个地区的牛源(非O157:H7)STEC分离株进行了18种抗生素的药物敏感性试验,并检测菌株中携带的超广谱β-内酰胺酶(ESBLs)基因。结果显示:4.31%STEC表现为多重耐药,1.91%为产ESBLs菌株。检测到的主要ESBLs基因包括bla_(TEM)和bla_(CTX-M)。这是首次在新疆STEC中检测到bla_(TEM)和bla_(CTX-M)。本研究分离出的多数多重耐药STEC属于系统发育A群。多重耐药STEC可能是由非致病性大肠杆菌获得毒性和耐药基因而形成的。抗生素的选择压力可能对细菌在牛肠道中的定植表现出一定竞争优势,从而增加了耐药STEC对食物的污染。
The objective of this study was to investigate the phenotypic and genotypic basis of bovine Shiga toxin-producing Escherichia coli(STEC)from Xinjiang and obtain the evolution and spread of STECs resistance.Susceptibility testing to 18 antimicrobials was performed on bovine(non-O157:H7)STEC isolates from 6 regions of Xinjiang.Meanwhile,the extended spectrumβ-lactamases(ESBL)genes were amplified.In this study 4.31%STEC isolates were multidrug resistant to antimicrobials(MDR),and 1.91%were ESBLs-producing strains.The predominant ESBL genes detected were bla TEM and bla CTX-M.This is the first report of bla TEM and bla CTX-M in STEC isolates in Xinjiang.Most resistant STECs(91.67%)isolated in this study belong to phylogenetic groups A.These findings suggest that MDR STECs are emerging as a result of nonpathogenic E.coli acquiring virulence and resistance genes.This may convey a certain competitive advantage for the colonization of these STECs in cattle when antimicrobial selective pressures are present,potentially leading to an increase in contamination of food with resistant STECs.
作者
佟盼盼
马凯琪
刘争辉
谢金鑫
苏红
王栋
孙雪
高姣姣
苏战强
TONG Panpan;MA Kaiqi;LIU Zhenghui;XIE Jinxin;SU Hong;WANG Dong;SUN Xue;GAO Jiaojiao;SU Zhanqiang(College of Veterinary Medicine, Xinjiang Agricultural University,Urumqi 830052, China)
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2019年第4期887-892,共6页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
新疆农业大学校前期资助课题(XJAU201703)
新疆农业大学研究生科研创新项目(XJAUGRI2017-010)
新疆农业大学国家级大学生创新创业训练计划项目(201810758011)