湘西黄牛粪源大肠埃希菌耐药性分析及多位点测序分型
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湖南省自然科学基金科教联合项目(2018JJ5050);湖南生物机电职业技术学院院级项目(20TD06)


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    摘要:

    为了解湘西黄牛粪源大肠埃希菌的耐药情况,从湘西黄牛主产区花垣县和凤凰县6个不同规模的湘西黄牛养殖场采集黄牛肛门拭子样品,用麦康凯培养基和大肠埃希菌特异性引物分离、鉴定大肠埃希菌;采用K–B法对分离的大肠埃希菌进行5类共18种常用抗菌药物的敏感性试验;利用超高通量荧光定量PCR对16株多重耐药大肠埃希菌的7类共22种耐药基因进行检测;用大肠埃希菌8个管家基因对此16株分离株进行多位点序列分型(MLST),并运用goeBURST程序和MEGA 7.0对其进行ST聚类分析和进化树分析。结果表明:从采集的206份黄牛肛门拭子样品中共分离、鉴定出大肠埃希菌170株;分离自各牛场的大肠埃希菌对四环素、多西环素、氨苄西林、复方新诺明和甲氧苄氨嘧啶的耐药性较高,耐药性最高的牛场对这5种抗菌药物的耐药率分别为29.63%、16.67%、22.22%、16.67%、33.33%,共有16株多重耐药菌,有8种耐药谱型;有acrA–01(100.00%)、fox5(81.25%)、sul1(68.75%)、sul2(75.00%)、folA(100.00%)、tetR–02(81.25%)、intI–1(clinic)(68.75%)和tnpA–01(50.00%)等6类8种耐药基因被检出;共获得11种ST型,其中,有9种新的ST型;16株分离株可分成2个克隆群和7个单独型;所有分离株聚集归为2个大群,分别为2个分支和7个分支。可见,湘西黄牛粪源大肠埃希菌的耐药性整体偏低,多重耐药菌主要出现于大型规模养殖场,且具有一定的复杂性,应加强对大型规模黄牛养殖场粪源大肠埃希菌耐药性的监控。

    Abstract:

    In order to understand the drug resistance of fecal Escherichia coli from Xiangxi cattle, anal swab samples of cattle were collected from six Xiangxi cattle farms of different scales in Huayuan County and Fenghuang County, the main production areas of Xiangxi cattle, and Escherichia coli was isolated and identified by maconkey medium and Escherichia coli specific primers; the sensitivity test of 18 kinds of common antibiotics in 5 categories was carried out on the isolated Escherichia coli by K-B method; 22 drug resistance genes of 7 classes of 16 strains of multidrug resistant Escherichia coli were detected by ultra-high throughput fluorescence quantitative PCR; multifocus sequence typing(MLST) of 16 isolates was carried out by 8 housekeeping genes of Escherichia coli, and ST cluster analysis and evolutionary tree analysis were carried out by goeBURST program and MEGA 7.0. The results showed that 170 strains of Escherichia coli were isolated and identified from 206 cattle anal swab samples; Escherichia coli isolated from cattle farms had high resistance to tetracycline, doxycycline, ampicillin, compound sulfamethoxazole and trimethoprim. The resistance rates of these five antibiotics in cattle farms with the highest resistance were 29.63%, 16.67%, 22.22%, 16.67% and 33.33%, respectively. There were 16 multi drug resistant bacteria and 8 drug resistance patterns. Six classes and eight kinds of drug resistance genes were detected, including acra-01(100.00%), fox5(81.25%), sul1(68.75%), sul2(75.00%), folA(100.00%), tetr-02(81.25%), inti-1(clinic)(68.75%) and tnpa-01(50.00%). A total of 11 ST types were obtained, and 9 new ST types were obtained. The 16 isolates were divided into 2 clonal groups and 7 haplotypes. All isolates were clustered into 2 groups, 2 branches and 7 branches, respectively. It could be concluded that the drug resistance of fecal Escherichia coli from cattle in Western Hunan was low. Multi drug resistant bacteria mainly appeared in large-scale farms and had a certain complexity. The monitoring of drug resistance of fecal Escherichia coli from large-scale cattle farms should be strengthened.

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汤起武,谭胜国,葛玲瑞,李运虎,田清武,余兴龙.湘西黄牛粪源大肠埃希菌耐药性分析及多位点测序分型[J].湖南农业大学学报:自然科学版,2022,48(1):.

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  • 在线发布日期: 2022-03-02
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