Characterization of Extended-Spectrum beta-Lactamase Genes Found among Escherichia coli Isolates from Duck and Environmental Samples Obtained on a Duck Farm
文献类型：期刊论文
| 作者 | Sun, Y; Zong, ZY; Lv, LC; Liu, JH; Ma, JY; Chen, ZL; Zeng, ZL; jhliu@scau.edu.cn; zizeng@scau.edu.cn; Zheng, HQ |
| 刊名 | APPLIED AND ENVIRONMENTAL MICROBIOLOGY
 |
| 出版日期 | 2012 |
| 卷号 | 78期号:10页码:3668-3673 |
| ISSN号 | 0099-2240 |
| 英文摘要 | In this study, we focused on evaluating the occurrence of extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli in fecal samples of healthy ducks and environmental samples from a duck farm in South China. Duck cloacal swabs and pond water samples were cultivated on MacConkey agar plates supplemented with ceftiofur. Individual colonies were examined for ESBL production. Bacteria identified as E. coli were screened for the presence of FSBL and plasmid-borne AmpC genes. The genetic relatedness, plasmid replicon type, and genetic background were determined. Of 245 samples analyzed, 123 had E. coli isolates with ceftiofur MICs higher than 8 mu g/ml (116 [50.4%] from 230 duck samples and 7 [46.7%] from 15 water samples). bla(CTX-M), bla(SHV-12), bla(CMY-2), and bla(DHA-1) were identified in 108, 5, 9, and 1 isolates, respectively. The most common bla(CTX-M) genes were bla(CTX-M-27) (n = 34), bla(CTX-M-55) (n = 27), bla(CTX-M-24e) (n = 22), and bla(CTX-M-105) (n = 20), followed by bla(CTX-M-14a), bla(CTX-M-14b), bla(CTX-M-24a), and bla(CTX-M-24b). Although most of the CTX-M producers had distinct pulsotypes, clonal transmission between duck and water isolates was observed. bla(CTX-M) genes were carried by transferable IncN, IncF, and untypeable plasmids. The novel CTX-M gene bla(CTX-M-105), was flanked by two hypothetical protein sequences, partial ISEcp1 upstream and truncated IS903D, iroN, orf1, and a Tn1721-like element downstream. It is suggested that the horizontal transfer of bla(CTX-M) genes mediated by mobile elements and the clonal spread of CTX-M-producing E. coli isolates contributed to the dissemination of bla(CTX-M) in the duck farm. Our findings highlight the importance of ducks for the dissemination of transferable antibiotic resistance genes into the environment. |
| 学科主题 | Biotechnology & Applied Microbiology ; Microbiology |
| 资助项目 | LMB |
| 语种 | 英语 |
| WOS记录号 | WOS:000303553900018 |
| 公开日期 | 2013-08-28 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/9922]  |
| 专题 | 南海海洋研究所_中科院海洋生物资源可持续利用重点实验室 |
| 通讯作者 | jhliu@scau.edu.cn; zizeng@scau.edu.cn |
| 推荐引用方式 GB/T 7714 | Sun, Y,Zong, ZY,Lv, LC,et al. Characterization of Extended-Spectrum beta-Lactamase Genes Found among Escherichia coli Isolates from Duck and Environmental Samples Obtained on a Duck Farm[J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY,2012,78(10):3668-3673. |
| APA | Sun, Y.,Zong, ZY.,Lv, LC.,Liu, JH.,Ma, JY.,...&Zheng, HQ.(2012).Characterization of Extended-Spectrum beta-Lactamase Genes Found among Escherichia coli Isolates from Duck and Environmental Samples Obtained on a Duck Farm.APPLIED AND ENVIRONMENTAL MICROBIOLOGY,78(10),3668-3673. |
| MLA | Sun, Y,et al."Characterization of Extended-Spectrum beta-Lactamase Genes Found among Escherichia coli Isolates from Duck and Environmental Samples Obtained on a Duck Farm".APPLIED AND ENVIRONMENTAL MICROBIOLOGY 78.10(2012):3668-3673. |
入库方式： OAI收割
来源：南海海洋研究所
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