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微生物学报

泰安渿河中产ESBLs大肠杆菌耐药性及耐药基因的传递规律
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国家十三五重点研发计划(2016YFD0500510、2016YFD0501608);泰山学者计划(201511023);山东省"双一流"计划(SYL2017YSTD11)


Antibiotic resistance and antibiotic resistance gene transfer of ESBLs-producing Escherichia coli in Naihe, Taian
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    摘要:

    [目的] 调查城市河流泰安市渿河(贯穿城区)中产超广谱β-内酰胺酶(extended-spectrum β-lactamases,ESBLs)大肠杆菌的分布及其多重耐药性与耐药基因携带情况,探究其耐药基因传递规律。[方法] 采用Kirby-Bauer法测定耐药表型,用PCR和基因序列测定法进行耐药基因、整合子检测和多位点序列分型,并进行细菌接合试验。[结果] 从272份水样中分离88株产ESBLs大肠杆菌,分离率32.4%,多重耐药率为59.1%。耐药基因检测出blaTEMqnrSAacC2aac(6')-Ib-croqxAOXAAacC4,携带率分别为94.3%、33.0%、29.5%、12.5%、11.4%、6.8%、5.6%,59.0%菌株携带多种耐药基因。MLST分型检测出47种ST型,ST38为主要分型占13.6%,发现ST131两株。I类整合子检出率26.1%,其中,dfrA17-aadA5阳性率为13.6%。接合率为83.0%(73/88),72.6%的接合子发生耐药谱变窄,供体菌所携带的七种耐药基因均发生了水平传递。[结论] 城市河流中细菌多重耐药现象严重且耐药性可水平传递,存在城市公共卫生安全隐患。

    Abstract:

    [Objective] To study the distribution of extended-spectrum β-lactamase-producing Escherichia coli in Naihe, Taian City, as well as its multiple antibiotic resistance and relative antibiotic resistance genes, and further reveal the mechanism of antibiotic resistance gene transmission.[Methods] We used Kirby-Bauer method to determine the antibiotic resistance profiles, PCR for the detection of antibiotic resistance genes and Class I integrons, and multilocus sequence typing among ESBLs-producing Escherichia coli strains, and conducted the bacterial conjugation test.[Results] We isolated 88 ESBLs-producing Escherichia coli strains out of 272 water samples with the detection rate of 32.4% and the multiple antibiotic resistance rate of 59.1%. Resistance genes including blaTEM, qnrS, AacC2, aac(6')-Ib-cr, oqxA, OXA and AacC4 were detected with the detection rates of 94.3%, 33.0%, 29.5%, 12.5%, 11.4%, 6.8% and 5.6% respectively. 59% of strains carried multiple drug resistance genes. We observed 47 sequence types (STs) in 88 isolates, and 13.6% of them were ST38; we also detected two ST131 strains. The positive rate of Class I integrons was 26.1%, and the predominate gene cassette was dfrA17-aadA5 with detection rate of 13.6%. The conjugation rate was 83.0% (73/88), 72.6% of the conjugates turned into narrower antibiotic resistance profiles. We observed horizontal transfer in all seven antibiotic resistance genes carried by the donor bacteria.[Conclusion] The bacterial multiple antibiotic resistance existed in urban rivers and the resistance genes were capable to transfer horizontally, which could be potential hazard that threatened public health.

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衣首静,刘青霄,蒋智宇,孙淑红. 泰安渿河中产ESBLs大肠杆菌耐药性及耐药基因的传递规律. 微生物学报, 2019, 59(11): 2194-2205

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  • 收稿日期:2019-01-12
  • 最后修改日期:2019-04-26
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  • 在线发布日期: 2019-11-01
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