期刊
FOODBORNE PATHOGENS AND DISEASE
卷 19, 期 9, 页码 637-647出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/fpd.2022.0016
关键词
extended-spectrum beta-lactamase; phylogroups; antimicrobial resistance; enteropathogenic Escherichia coli; dairy; poultry
资金
- North Carolina State University College of Veterinary Medicine [1U18FD00678801]
- FDA GenomeTrakr program
This study utilized whole genome sequencing to characterize antimicrobial resistance and virulence genes in Salmonella and E. coli isolates from small-scale dairy and poultry farms in North Carolina. The findings highlighted the significance of vegetative buffer zones in reducing the transmission of enteric pathogens in agricultural systems.
An increasing number of outbreaks are caused by foodborne pathogens such as Escherichia coli and Salmonella, which often harbor antimicrobial resistance (AMR) genes. We previously demonstrated the transmission of pathogens from animal operations to produce fields on sustainable farms, which illustrated an urgent need to develop and implement novel prevention methods and remediation practices such as the vegetative buffer zone (VBZ) to prevent this movement. The focus of this study was to use whole-genome sequencing (WGS) to characterize the AMR, virulence, and single-nucleotide polymorphism profile of 15 Salmonella and 128 E. coli isolates collected from small-scale dairy and poultry farms on a research station in North Carolina. Phenotypically, seven E. coli and three Salmonella isolates displayed resistance to antibiotics such as tetracycline (n = 4), ampicillin (n = 4), nalidixic acid (n = 3), chloramphenicol (n = 2), sulfisoxazole (n = 1), and streptomycin (n = 1). A single E. coli isolate was found to be resistant to five different antibiotic class types and possessed the bla(TEM-150) resistance gene. Virulence genes that facilitate toxin production and cell invasion were identified. Mauve analysis of the E. coli isolates identified seven clusters (dairy-six and poultry-one) indicating that transmission is occurring from animal operations to fresh produce fields and the surrounding environment when the VBZ is denudated. This suggests that the VBZ is a useful barrier to reducing the transmission of enteric pathogens in agricultural systems. Our study demonstrates the prevalence of AMR and virulence genes on small-scale sustainable farms and highlights the advantage of using WGS to assess the impact of the VBZ to reduce the transmission of E. coli and Salmonella.
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