Salmonella Prevalence is Low in Deep Tissue Lymph Nodes of Hog Carcasses from a Pork Processing Plant in Alberta, Canada

Citation

Jones, T.H., Service, C., Hrycauk, S., Gzyl, K.E., Holman, D.B. (2023). Salmonella Prevalence is Low in Deep Tissue Lymph Nodes of Hog Carcasses from a Pork Processing Plant in Alberta, Canada. Food Protection Trends (FPT), [online] 43(5), 383-390. http://dx.doi.org/10.4315/FPT-23-005

Plain language summary

Salmonella is an important foodborne pathogen that can be associated with pork products and deep tissue lymph nodes (DTLNs) that are largely protected from carcass decontamination methods may be a potential source for contamination with Salmonella. This study indicates that the prevalence of Salmonella in DTLNs in pork carcasses is very low and likely only represents a minor source of contamination in pork production. These findings have important implications for the pork industry in terms of assessing the costs and benefits of removing DTLNs from pork cuts and trimmings.

Abstract

Deep tissue lymph nodes (DTLNs) could be an important source of Salmonella in pork because carcass decontam-ination strategies have no effect on Salmonella cells that are deeply embedded and protected. The objective of this study was to determine the prevalence, concentration, and antimicrobial resistance of Salmonella in DTLNs in chilled hog carcasses as well as in ground pork. A total of 400 DTLNs were collected over a 10-month period from a commercial pork processing plant. Salmonella was detected in 2 (0.5%) of 400 DTLNs; Salmonella Uganda was detected in a DTLN from the belly and Salmonella Bovismorbifi-cans in one DTLN from the shoulder. Salmonella Uganda was also detected in one ground pork sample. The three Salmonella isolates were susceptible to all antimicrobials tested, and no clinically significant antimicrobial resistance genes were detected in these genomes after sequencing. The prevalence of Salmonella in DTLNs in pork tissues intended for human consumption is very low and could be a minor source of contamination in the production of ground pork. These findings are important for the pork industry to assess the risks and benefits of removing DTLNs from pork cuts and trimmings.

Publication date

2023-01-01

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