北京市售鸡肉和猪肉中大肠杆菌污染情况及耐药特征分析
作者:
作者单位:

1.北京市疾病预防控制中心食物中毒诊断溯源技术北京市重点实验室,北京 100013;2.北京市预防医学研究中心,北京 100020;3.首都医科大学公共卫生学院,北京 100069;4.中国农业大学动物医学院国家兽药安全评价中心,北京 100193;5.内蒙古医科大学公共卫生学院,内蒙古 呼和浩特 010110

作者简介:

吴萱 女 在读研究生 研究方向为食源性致病菌耐药性研究 E-mail: sylviaxuanwu@qq.com

通讯作者:

李会 女 副研究员 研究方向为食源性致病菌耐药性研究 E­mail: lihui@bjcdc.org

中图分类号:

R155

基金项目:

首都卫生发展科研创新专项(2018-4-3017);国家重点研发计划项目(2018YFD0500305)


Prevalence and antimicrobial susceptibility of Escherichia coli in raw chicken and pork from Beijing
Author:
Affiliation:

1.Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Centre for Disease Prevention and Control, Beijing 100013, China;2.Beijing Prevention Medicine Research Center, Beijing 100020, China;3.School of Public Health, Capital Medical University, Beijing 100069, China;4.National Center for Veterinary Drug Safety Evaluation, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China;5.School of Public Health, Inner Mongolia Medical University, Inner Mongolia Hohhot 010110, China

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    摘要:

    目的 分析北京市售生鸡肉和生猪肉中大肠杆菌的污染情况以及耐药表型及耐药基因型。方法 从北京市辖6个区的大型超市和农贸市场随机采集259份生鲜肉类样品(鸡肉168份、猪肉91份),增菌后分离大肠杆菌,并使用基质辅助激光解吸电离-飞行时间质谱和16 s rRNA测序对分离菌株进行鉴定。对分离菌株进行药物敏感性测定和全基因组测序,对耐药基因和耐药表型进行比较分析。结果 从259份样品中分离出169株大肠杆菌,检出率为65.25%,其中鸡肉和猪肉中大肠杆菌的检出率分别为77.38%和42.86%。药敏试验结果表明大肠杆菌对甲氧苄氨嘧啶-磺胺甲恶唑(鸡肉83.33%,猪肉91.67%)高度耐药,其次是多西环素(鸡肉32.35%,猪肉38.89%),同时,它们对庆大霉素、妥布霉素、头孢噻肟、黏菌素等药物都呈现出了不同程度的耐药性。耐药基因分析发现β-内酰胺类基因ampC1ampC2携带水平最高,检出率分别为93.10%、98.28%,另外也检测到ESBLNDM-1mcr-1等重要耐药基因,其中blaTEM-1DblaCTX-M-9是主要存在的ESBL耐药基因。结论 目前北京市售鸡肉存在较为严重的大肠杆菌污染,分离菌株呈现复杂的耐药表型并携带多样的耐药基因,应加强对生鲜肉类样品的微生物污染和细菌耐药性控制,尤其是产ESBL耐药大肠杆菌,为预防控制由其引起的食源性疾病提供科学依据。

    Abstract:

    Objective To investigate the contamination characteristic, antibiotic resistance phenotype and genotype of Escherichia coliE.coli) in raw chicken and raw pork in Beijing.Methods A total of 259 meat samples (91 pork and 168 chicken) were randomly collected from large and small supermarkets and farmer’s markets in various regions of Beijing. E.coli was isolated after enrichment. The isolated strains were identified by MALDI-TOF/MS and 16 s rRNA sequencing. The Gram-negative bacteria drug sensitivity plate was used for the antimicrobial susceptibility test of the isolated strains, and the whole genome was sequenced to analyze the antibiotic-resistant genotypes.Results 169 strains of E.coli were isolated from 259 samples, with a detection rate was 65.25%, among which the detection rates of E.coli in chicken and pork were 77.38% and 42.86% respectively. The result of antibiotic susceptibility test showed that E.coli was highly resistant to trimethoprim-sulfamethoxazole (83.33% in chicken and 91.67% in pork), followed by doxycycline (32.35% in chicken and 38.89% in pork). Meanwhile, they also showed different degrees of antibiotic resistance against gentamicin, tobramycin, cefotaxime and colistin. Genotyping analysis found that β-lactam genes ampC1 and ampC2 had the highest carrying rate of 93.10% and 98.28%, respectively. In addition, multidrug resistance genotypes such as ESBL, NDM-1 and mcr-1 were also detected, among which blaTEM-1D and blaCTX-M-9 were the main ESBL resistance genes.Conclusion At present, there is a serious E.coli contamination in raw meat in Beijing, especially in chicken. The isolated strains not only showed complex antibiotic-resistance phenotypes, but also carried a variety of antibiotic-resistance genotypes. The control of microbial contamination and bacterial drug resistance in fresh meat samples should be strengthened, especially ESBL-producing Escherichia coli, which provided a scientific basis for the prevention and control of foodborne diseases.

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吴萱,杨璐,刘艳超,吴一戈,李会,邵兵.北京市售鸡肉和猪肉中大肠杆菌污染情况及耐药特征分析[J].中国食品卫生杂志,2022,34(2):211-216.

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  • 收稿日期:2021-10-11
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  • 在线发布日期: 2022-05-18
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