文献类型： 外文期刊

作者： Ma, Jiangang ¹ ; Zhou, Wei ² ; Wu, Jing ¹ ; Liu, Xiaofeng ³ ; Lin, Jiahui ¹ ; Ji, Xiaofeng ¹ ; Lin, Hui ¹ ; Wang, Jianmei ¹ ; Jiang, Han ⁴ ; Zhou, Qianjin ⁵ ; Zhao, Guoping ⁶ ; Yang, Hua ¹ ; Tang, Biao ¹ ;

作者机构： 1.Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual, Inst Agroprod Safety & Nutr, Hangzhou, Zhejiang, Peoples R China

2.Zhejiang Prov Ctr Anim Dis Prevent & Control, Hangzhou, Zhejiang, Peoples R China

3.Zhejiang Univ Technol, Coll Food Sci & Technol, Hangzhou, Zhejiang, Peoples R China

4.China Jiliang Univ, Key Lab Marine Food Qual & Hazard Controlling Te, Hangzhou, Zhejiang, Peoples R China

5.Ningbo Univ, Sch Marine Sci, Ningbo, Zhejiang, Peoples R China

6.Chinese Acad Sci, Shanghai Inst Biol Sci, CAS Key Lab Synthet Biol Inst Plant Physiol & Eco, Shanghai, Peoples R China

关键词： Escherichia coli; antimicrobial resistance; antimicrobial resistance gene; food animal; heavy metal

期刊名称：MICROBIOLOGY SPECTRUM （ 影响因子：3.7； 五年影响因子：5.9 ）

ISSN： 2165-0497

年卷期： 2022 年 10 卷 4 期

页码：

收录情况： SCI

摘要： Widely distributed multidrug-resistant (MDR) bacteria threaten animals and human health. Nevertheless, few antimicrobial resistance (AMR) surveys of large-scale animal-derived bacteria have been explored. Here, 1,468 (97.54%) Escherichia coli strains were isolated from 1,505 pig (1,060) and chicken (445) anal swab samples from 11 cities in Zhejiang Province, China, in 2020. These isolates had a high resistance to tetracycline (92.92%), sulfisoxazole (93.05%), florfenicol (83.11%), and ampicillin (78.27%). More than 88.68% of the strains were MDR bacteria. A low AMR ratio to the "last-resort" antimicrobials tigecycline (0.75%), colistin (1.36%), and meropenem (0.75%) were found. The AMR of E. coli from pigs was higher than that of chickens. Eighteen strains among 31 MDR strains that were resistant to "last-resort" antimicrobials could transfer the AMR genes (mcr-1, tet(X), and blaNDM) to the recipient strain J53, which confer colistin, tigecycline, and carbapenem resistance, respectively. The homology among mcr-1-carrying isolates was relatively high, and the sequence types were mainly ST5529, ST101, and ST354, while the homology of isolates harboring tet(X4) and bla(NDM-5) genes were different. The mcr-1, blaNDM-5, and tet(X4) genes in strains LS45, JH51, and TZ118 were identified on the Incl2, IncHI2, and IncX1 plasmids, respectively. Moreover, tet(A), sul2, floR, and bla(TEM-1B) were the most common ARGs in 31 strains. Additionally, the heavy metals copper and zinc had a significant correlation with amoxicillin/clavulanate and tetracycline resistance. Controlling the movement of animals between cities and reducing the use of antimicrobials are effective methods to reduce the threat of AMR bacteria. IMPORTANCE Pigs and chickens are the most common food animals that are the important vectors for spreading antimicrobial-resistant pathogens among animals and humans. Limited systematic AMR monitoring of these food animal origin bacteria had been reported, especially in developed areas of China. Our study provides a comprehensive and systematic study of AMR in Escherichia coli from eastern China. The AMR of E. coli strains among the animals or cities has statistically significant differences. Moreover, the mcr-1, tet(X4), and blaNDM- 5 genes, considered resistant to the last line of AMR, were identified in part of farms. The transferability and the prevalence of these AMR strains were intensively studied. Our monitoring is comparable to human clinical research and has an essential reference for public health safety. These findings will provide early warning for AMR strains and guide the clinical use of antibiotics to control the spread of antibiotic resistance.