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Chen X, Ju ZJ, Li C, Wang Q, Yang X, Huang ZR, Lei CW, Wang HN. Epidemiological characteristics of human- and chicken-derived CTX-M-type extended-spectrum β-lactamase-producing Escherichia coli from China. Vet Microbiol 2024; 293:110072. [PMID: 38640638 DOI: 10.1016/j.vetmic.2024.110072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 03/21/2024] [Accepted: 03/31/2024] [Indexed: 04/21/2024]
Abstract
Bacterial resistance to β-lactams is mainly attributed to CTX-M-type extended-spectrum β-lactamases (ESBLs). However, the predominant sequence type (ST) of blaCTX-M-carrying Escherichia coli (blaCTX-M-Ec) in chickens, an important food animal, in China and its contribution to human β-lactam resistance are not investigated. In this study, approximately 1808 chicken-derived strains collected from 10 provinces from 2012 to 2020 were screened for blaCTX-M-Ec, and 222 blaCTX-M-Ec were identified. Antimicrobial susceptibility tests, whole genome sequencing and conjugation experiment were performed. All quality-controlled 136 chicken-derived blaCTX-M-Ec and 1193 human-derived blaCTX-M-Ec genomes were downloaded from NCBI and EnteroBase to comprehensively analyze the prevalence of blaCTX-M-Ec in China. blaCTX-M-55 (153/358, 42.7% in chicken isolates; 312/1193, 26.2% in human isolates) and blaCTX-M-14 (92/358, 25.7% in chicken isolates; 450/1193, 37.7% in human isolates) were dominant in blaCTX-M-Ec. The STs of blaCTX-M-Ec were diverse and scattered, with ST155 (n = 21) and ST152 (n = 120) being the most abundant in chicken- and human-derived isolates, respectively. Few examples indicated that chicken- and human-derived blaCTX-M-Ec have 10 or less core genome single nucleotide polymorphisms (cgSNPs). Genetic environment analysis indicated that ISEcp1, IS26 and IS903B were closely associated with blaCTX-M transfer. The almost identical pc61-55 and pM-64-1161 indicated the possibility of plasmid-mediated transmission of blaCTX-M between humans and chickens. Although the genomes of most blaCTX-M-Ec isolated from chickens and humans were quite different, the prevalence and genetic environment of blaCTX-M variants in both hosts were convergent. CTX-M-mediated resistance is more likely to spread through horizontal gene transmission than bacterial clones.
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Affiliation(s)
- Xuan Chen
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Zi-Jing Ju
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Chao Li
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Qin Wang
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Xue Yang
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Zhe-Ren Huang
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China
| | - Chang-Wei Lei
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China.
| | - Hong-Ning Wang
- College of Life Sciences, Sichuan University, Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu, China; Animal Disease Prevention and Food Safety Key Laboratory of Sichuan Province, Chengdu, China.
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