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Salmonella Infections · Journal article
Food Microbiology · July 4, 2026
Encouraging direction, but not yet definitive.
A genomic epidemiology and risk assessment study of 237 Salmonella isolates from Jiangxi, China identifies ST34 as a multidrug-resistant clone with 8.3% annual increase, dominates urban retail and clinical sources, and shows minimal genetic distance (2–10 core genome SNPs) to agricultural wastewater isolates, implicating the food chain as the transmission vector. Quantitative microbial risk assessment modelling predicted a 139-fold higher median annual infection risk in rural populations exposed to contaminated irrigation water. These findings are suggestive but derive from observational data and modelling rather than experimental intervention studies.
Genomic epidemiology study with quantitative microbial risk assessment modelling. Salmonella isolates collected from urban retail food environments, rural livestock and pre-harvest agricultural settings, agricultural wastewater systems, and clinical human cases in Jiangxi Province, China.. Intervention: None; observational study of naturally occurring isolates and environmental contamination patterns.. Compared with: Geospatial comparison (urban vs. rural) and clonal lineage comparison (ST34 vs. ST155 and other lineages).. n = 237. Jiangxi Province, China.
ST34 MDR prevalence 72.4% in urban retail and clinical sources; ST155 MDR prevalence 31.2% in rural areas ST34 showed 8.3% annual increase over study period Minimal genetic distances of 2–10 core genome SNPs between ST34 isolates from agricultural wastewater and urban clinical cases
Rural populations faced 139-fold higher median annual infection risk due to exposure to contaminated irrigation water for fresh produce
Clinicians and public health professionals in agricultural regions should be aware of elevated foodborne Salmonella risk from contaminated irrigation water and the circulation of highly resistant ST34. These findings support pre-harvest interventions and water management but require implementation pilots and outcomes studies to confirm risk reduction benefit.
Genomic epidemiology study with quantitative risk modelling showing plausible transmission pathway and geospatial risk disparity, but observational design without experimental validation limits immediate practice impact.
As stated by the source record.
Quoted from the source exactly as published.
Clinicians and public health professionals in agricultural regions should be aware of elevated foodborne Salmonella risk from contaminated irrigation water and the circulation of highly resistant ST34. These findings support pre-harvest interventions and water management but require implementation pilots and outcomes studies to confirm risk reduction benefit.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
The dissemination of multidrug-resistant (MDR) Salmonella from agricultural environments into food systems constitutes a major safety hazard. This study combined genomic epidemiology and quantitative microbial risk assessment (QMRA) to investigate Salmonella transmission dynamics across urban and rural food environments in Jiangxi, China. Among 237 Salmonella isolates collected from Jiangxi Province, China (2015-2021), a distinct geospatial clonal stratification emerged: the highly resistant ST34 clone (72.4% MDR) dominated urban retail food and clinical sources, whereas the livestock-associated ST155 (31.2% MDR) predominated in rural areas. The expansion of ST34 (8.3% annual increase) was driven by a robust genetic architecture, exhibiting significantly higher resistance and virulence scores than other lineages. Crucially, genomic analysis provided strong evidence of direct transmission from pre-harvest environments, supported by minimal genetic distances (2-10 core genome single nucleotide polymorphisms) between ST34 isolates from agricultural wastewater and urban clinical cases, implicating the food supply chain as the primary vector. Furthermore, QMRA confirmed a profound geospatial disparity in foodborne infection risk, with rural populations facing a 139-fold higher median annual risk due to exposure to contaminated irrigation water used for fresh produce. These findings demonstrate that agricultural waste streams act as active conduits for high-risk MDR Salmonella entering the food chain, creating disproportionate regional health burdens. This study underscores the urgent need for targeted pre-harvest interventions, improved water management, and the implementation of integrated One Health surveillance systems to safeguard the microbiological safety of the food supply.
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