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Zhang P, Liu L, Sheng H, Zhang M, Wang T, Chang G, Wang Y, Bai L, Wang X. Antibiotic Resistance and Genomic Analysis of Shiga Toxin-Producing Escherichia coli from Dairy Cattle, Raw Milk, and Farm Environment in Shaanxi Province, China. Foodborne Pathog Dis 2024; 21:624-633. [PMID: 39042484 DOI: 10.1089/fpd.2023.0098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024] Open
Abstract
To investigate the epidemiology of Shiga toxin-producing Escherichia coli (STEC) in dairy cattle, 975 samples (185 feces, 34 silage, 36 cattle drinking water, 360 raw milk, and 360 teat skin swabs) were collected from two dairy farms in Baoji and Yangling, Shaanxi Province, China, and were screened for STEC. Whole-genome sequencing was used to analyze the genomic characteristics and potential transmission of STEC isolates. A total of 32 samples were contaminated with STEC, including 4.0% (19/479) in Farm A and 2.6% (13/496) in Farm B. Compared with adult cows (4.5%), nonadult cows had a higher rate (21.3%) of STEC colonization. A total of 14 serotypes and 11 multilocus sequence typing were identified in 32 STEC isolates, among which O55:H12 (25.0%) and ST101 (31.3%) were the most predominant, respectively. Six stx subtypes/combinations were identified, including stx1a (53.1%), stx2g (15.6%), stx2d, stx2a+stx2d, stx1a+stx2a (6.3%, for each), and stx2a (3.1%). Of 32 STEC isolates, 159 virulence genes and 27 antibiotic resistance genes were detected. Overall, STEC isolates showed low levels of resistance to the 16 antibiotics tested (0-40.6%), with most common resistance to ampicillin (40.6%). The phylogenetic analysis confirmed that STEC in the gut of cattle can be transmitted through feces. The results of this study help to improve our understanding of the epidemiological aspects of STEC in dairy cattle and provide early warning and control of the prevalence and spread of the bacterium.
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Affiliation(s)
- Pengfei Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
- College of Food Science, Shanxi Normal University, Taiyuan, Shanxi, China
| | - Lisha Liu
- National Health Commission Key Laboratory of Food Safety Risk Assessment, Food Safety Research Unit (2019RU014) of Chinese Academy of Medical Science, Beijing, China
| | - Huanjing Sheng
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Meng Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Ting Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Guanhong Chang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yeru Wang
- National Center for Food Safety Risk Assessment, Beijing, China
| | - Li Bai
- National Center for Food Safety Risk Assessment, Beijing, China
| | - Xin Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
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Han Y, Liu M, Han Y, Shi N, Wang Q, Cui T, Yang L, Zhang X, Zhu L, Qian H, Jin H, Dong C. Genetic and phylogenetic characterization of Shiga toxin-producing Escherichia coli and enteropathogenic E. coli from livestock in Jiangsu by using whole-genome sequencing. J Appl Microbiol 2022; 132:3925-3936. [PMID: 35174586 DOI: 10.1111/jam.15494] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 01/19/2022] [Accepted: 02/12/2022] [Indexed: 11/29/2022]
Abstract
AIMS There are knowledge gaps regarding STEC and EPEC strains in livestock in Jiangsu, China. This study aimed to evaluate the potential public health significance of STEC and EPEC strains isolated from livestock by determining the serotypes, virulence profiles, and genetic relationship with international STEC strains. METHODS AND RESULTS A total of 68 STEC and 37 EPEC strains were obtained from 231 fecal sheep samples and 70 fecal cattle samples. By using whole-genome sequencing (WGS) analysis, all STEC belonged to 15 O:H serotypes and the most prevalent serotypes were O6:H10 (19.1%), O155:H21 (14.7%), and O21:H25 (10.3%). The main Shiga toxin gene subtypes detected were stx1c (41.2%), stx1a (26.5%), stx2b (14.7%) and stx2k (14.7%). Only the STEC from cattle carried eae gene. Other adherence-associated or toxin-related genes, including lpfA (70.6%), iha (48.5%), subA (54.4%), and ehxA (33.8%), were found in STEC. All EPEC strains were bfpA-negative, and the predominant eae variants were eae-β1 (62.2%), eae-ζ (21.6%), and eae-θ (8.1%). The core-genome multi-locus sequence typing (cgMLST) analysis revealed nine scattered clusters in STEC and one dominant cluster in EPEC. The strains with the same serotypes, including O22:H8 and O43:H2 in the two towns, possessed a closely genomic distance. The core genome single nucleotide polymorphism (cgSNP) showed that part of STEC strains in this study were clustered with isolates possessing the same serotypes from the Netherlands, Sweden, and Xinjiang of China. Five serotypes of STEC isolates were associated with the clinical STEC strains from databases. CONCLUSION This study provided the diverse serotypes and the virulence genes profiles in STEC and EPEC strains. Local strains possessed widely diverse and scattered clusters by cgMLST. Closely genomic correlation with clinical isolates displayed that part of the STEC strains may threaten to public health. SIGNIFICANCE AND IMPACT OF THE STUDY Non-O157 STEC strains act as important pathogens for human infections. This study supports the increased surveillance work of non-O157 STEC rather than just O157 STEC in this region.
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Affiliation(s)
- Yue Han
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Minqi Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Ying Han
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Naiyang Shi
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Qiang Wang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Tingting Cui
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Liuqing Yang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Xuefeng Zhang
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu, Nanjing, China
| | - Liguo Zhu
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu, Nanjing, China
| | - Huimin Qian
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu, Nanjing, China
| | - Hui Jin
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education School of Public Health Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics School of Public Health Southeast University, Nanjing, China
| | - Chen Dong
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu, Nanjing, China
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