摘要
目的 了解新疆喀什地区腹泻羔羊源产ESBL大肠杆菌的流行情况及耐药性,指导临床大肠杆菌病的防治.方法 采集385份喀什地区腹泻羔羊肛周粪便,分离得到371株大肠杆菌,通过双纸片协同法筛选产ESBL大肠杆菌,对筛选到的菌株进行耐药基因鉴定、耐药性分析和系统进化分群研究.结果 371株大肠杆菌中204株为产ESBL菌株,blaCTX-M、blaCTX-M-1G、blaCTX-M-9G和blaTEM耐药基因携带率分别为67.65％、69.12％、30.39％和63.73％,产ESBL阳性菌株均为多重耐药,对氨苄西林、头孢噻肟、庆大霉素、恩诺沙星、阿奇霉素、四环素、氯霉素、甲氧苄啶、氨曲南8种药物的耐药率为90.69％～100％,系统进化分群主要分布于A群和D群,其中A群菌株以10重耐药为主(41.11％),D群菌株以11重耐药为主(40％).结论 产ESBL菌株大肠杆菌是引起喀什地区羔羊腹泻的主要病原菌,以A群为主,且均为多重耐药.
Abstract
The objective of this study was to determine the frequency and resistance patterns of ESBL-producing E.coli in lambs with diarrhea in the Kashi area,Xinjiang.The findings may provide guidance for the prevention and control of clinical E.coli disease.We collected 385 samples of perianal feces from lambs with diarrhea in the Kashgar area.From these samples,we isolated 371 strains of E.coli.We then used the double-paper-sheet synergistic method to screen for ESBL-producing E.coli.Additionally,we conducted analyses to identify drug-resistance genes,analyze drug resistance,and study the phylo-typing of the screened strains.Of 371 E.coli strains,204 were identified as ESBL-producing strains.The prevalence rates of blaCTX-M,blaCTX-M-1G,blaCTX-M-9G,and bla TEM resistance genes was 67.65％,69.12％,30.39％,and 63.73％,respectively.All ESBL-pro-ducing strains were resistant to multiple drugs,with resistance rates ranging from 90.69％to 100％for eight specific drugs:ampicillin,cefotaxime,gentamicin,enrofloxacin,azithromy-cin,tetracycline,chloramphenicol,methotrexate,and amitrazine.The phylogenetic subgroups of the strains were distributed primarily in groups A and D.Among group A strains,41.11％exhibited resistance to ten drugs,whereas among group D strains,40％exhibited resistance to 11 drugs.ESBL-pro-ducing strains of Escherichia coli are the main pathogens cau-sing diarrhea in lambs in the Kashgar region;group A is the main group,and all groups are multi-drug resistant.
基金项目
新疆肉牛肉羊高效生产及产品加工技术集成创新示范项目(2021A02003)
自治 区"三农"骨干人才培养项目(2022SNGGGCC015)
维普
万方数据