徐州市市售生肉中单核细胞增生李斯特菌污染及其分子特征分析
作者:
作者单位:

徐州市疾病预防控制中心检验科,江苏 徐州 221006

作者简介:

余峰玲 女 副主任技师 研究方向为食源性致病菌的检测 E-mail:1297721853@qq.com

通讯作者:

童晶 女 主任技师 研究方向为食源性致病菌的检测 E-mail:53439716@qq.com

中图分类号:

R155

基金项目:


Molecular characterization and contamination of Listeria monocytogenes in raw meat sold in Xuzhou city
Author:
Affiliation:

Xuzhou Center for Disease Control and Prevention Laboratory, Jiangsu Xuzhou 221006, China

Fund Project:

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    摘要:

    目的 分析2018年和2020年徐州市市售生肉中单核细胞增生李斯特菌检出率及其分子生物学特征。方法 随机采集市区零售鲜或冷冻生禽肉及调理肉,按照GB 4789.30—2016《食品安全国家标准 食品微生物学检验 单核细胞增生李斯特氏菌检验》对单核细胞增生李斯特菌进行分离、鉴定,并分析其血清型、耐药性、毒力基因型、脉冲场凝胶电泳(PFGE)分子分型。结果 142份市售生肉中有40份检出单核细胞增生李斯特菌,检出率为28.2%(40/142);血清型主要为1/2a型,占50.0%(20/40);40株单核细胞增生李斯特菌共分为15种PT型;对氨苄西林及青霉素耐药菌株分别有4株和2株;所有菌株均携带多种毒力基因。结论 徐州市市售生肉中单核细胞增生李斯特菌污染较严重,存在小规模同源菌株,需进一步加强监测管理,以防食源性疾病的发生。

    Abstract:

    Objective This study aimed to analyze the relevance ratio and molecular biological characteristics of Listeria monocytogenes (L. monocytogenes) in raw meat sold in Xuzhou city in both 2018 and 2020.Methods Retail fresh and frozen raw poultry, as well as prepared meat, were randomly sampled from urban areas, and L. monocytogenes were isolated and identified following the guidelines of GB 4789.30-2016. The study analyzed serotypes, drug resistance patterns, virulence genotypes, and molecular typing through pulsed field gel electrophoresis (PFGE).Results Out of 142 raw meat samples collected from the market, 40 tested positive for L. monocytogenes, resulting in a prevalence rate of 28.2% (40/142). The predominant serotype was 1/2a, accounting for 47.5% (19/40) of the isolates. Molecular typing using PFGE revealed 15 distinct PFGE types among the 40 L. monocytogenes strains. Additionally, 4 strains exhibited resistance to ampicillin, and 2 strains were resistant to penicillin. All strains carried multiple virulence genes.Conclusion This study highlighted the relatively high contamination of L. monocytogenes in raw meat sold in urban Xuzhou. The presence of small-scale homologous strains emphasizes the importance of enhanced monitoring and management to prevent foodborne diseases.

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余峰玲,许艳平,冯欢欢,王潇,渠淑晴,童晶.徐州市市售生肉中单核细胞增生李斯特菌污染及其分子特征分析[J].中国食品卫生杂志,2023,35(8):1146-1151.

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  • 收稿日期:2022-02-11
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  • 在线发布日期: 2023-12-13
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