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首页> 中文期刊> 《农业科学学报（英文版）》 >Characterization of blaCTX-M Gene in One Klebsiella pneumoniae Isolate from Sick Chickens in China

Characterization of blaCTX-M Gene in One Klebsiella pneumoniae Isolate from Sick Chickens in China

         
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摘要

Two Klebsiella pneumoniae isolates (Kpc1 and Kpc2) were obtained from liver samples of seven dead chickens and identified with Vitek-32 automated identification system. Antimicrobial susceptibilities were determined by the microdilution broth method. Detection of genes encoding class A β-lactamases was performed by PCR amplification, and cloning of the ESBL gene was by plasmid restriction and fragments ligation. Conjugation assay, transformation experiments and plasmid profile analysis were performed. The incompatibility group of ESBL-carrying plasmid was determined by the PCR-based replicon typing method. Lastly, the genetic environment was analysed by direct sequencing of the DNA surrounding the ESBL gene. The genes associated with tetracycline and gentamicin resistance were also sought by PCR. The results revealed that the ESBL phenotype-negative strain Kpc2 only showed resistance to ampicillin, amoxicillin, tetracycline, and doxycycline and carried bla TEM-1 and tet(A) genes. The ESBL-producing strain Kpc1 exhibited multidrug resistant phenotype and harbored bla TEM-1 , bla CTX-M-14 , tet(A), tet(B), and rmtB genes. K. pneumoniae Kpc1 contained four plasmids with molecular sizes of approximately 59, 6.9, 2.8, and 1.6 kb, but only a 59-kb plasmid, carried bla TEM-1 and bla CTX-M-14 genes, was observed in its transconjugant. The incompatibility group of plasmid carrying bla CTX-M-14 gene could not be determined. The bla CTX-M-14 gene was flanked upstream by an ISEcp1 insertion sequence and downstream by an IS903 element. This work shows that CTX-M-14 is present in K. pneumoniae isolates from chickens in China. The bla CTX-M-14 gene was associated with an upstream ISEcp1 insertion sequence. Our results underline the need for continuous surveillance of the prevalence and evolution of this CTX-M-type β-lactamase in China.

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  • 来源
    《农业科学学报（英文版）》 |2012年第10期|1714-1720|共7页
  • 作者

    HU Gong-zheng; HU Han; LIU Bao-guang; YUAN Li; LIU Jian-hua; PAN Yu-shan; WU Hua; CHEN Yu-xia;

  • 作者单位

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P.R. China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

    College of Animal Husbandry and Veterinary Science, Henan Agricultural University, Zhengzhou 450002, P.R.China;

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