Prevalence of the phenicol resistance gene fexA in Campylobacter isolated from the poultry supply chain

文献类型： 外文期刊

第一作者： Tang, Biao

作者： Tang, Biao;Zheng, Xue;Lin, Jiahui;Wu, Jing;Lin, Rumeng;Ji, Xiaofeng;Yang, Hua;Tang, Biao;Zheng, Xue;Lin, Jiahui;Wu, Jing;Lin, Rumeng;Ji, Xiaofeng;Yang, Hua;Zheng, Xue;Xia, Fei;Lin, Rumeng;Jiang, Han;Shen, Zhangqi

作者机构：

关键词： Campylobacter; Florfenicol; fexA; Antimicrobial resistance; Whole genome sequencing

期刊名称：INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY （ 影响因子：5.911； 五年影响因子：5.92 ）

ISSN： 0168-1605

年卷期： 2022 年 381 卷

页码：

收录情况： SCI

摘要： Florfenicol, an animal-specific broad-spectrum antibiotic, has been widely used in livestock and poultry breeding, which leads to the high antimicrobial resistance (AMR) of Campylobacter in food animals. Recently, a new florfenicol resistance gene, fexA, often located on various multidrug resistance genomic islands (MDRGIs) and confers resistance to various antimicrobial agents, was characterized in Campylobacter. However, the prevalence and genetic environments of fexA and its associated MDRGIs in Campylobacter in the poultry supply chain need further characterization. Here, a total of 111 (15.48 %) Campylobacter isolates (63 C. jejuni, 40 C. coli, 8 C. lari) were obtained from 717 samples from farms, slaughterhouses, and supermarkets. Both phenotypic and genotypic analyses indicated that the AMR of C. coli was significantly higher than that of C. jejuni. PCR ampli-fication and whole genome sequencing showed that the fexA gene was present in 26 out of 35 florfenicol-resistant Campylobacter isolates. This gene was located in the tet(L)-fexA-tet(O) MDRGI. The fexA-harboring isolates detected in the above sources could be clustered into the same branch, indicating that they may have the same ancestor. In addition, the erm(B) gene was identified in 17 Campylobacter isolates, and the A2075G point mu-tation in the 23S rRNA gene occurred in 26 isolates, emphasizing the high resistance of Campylobacter to mac-rolides. In summary, these results indicate that fexA within the MDRGI of Campylobacter can be transmitted through bacteria in the animal-based food supply chain, and it is necessary to strengthen the monitoring of the prevalence and spread of fexA in foodborne Campylobacter spp.

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