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Email Content: Poultry Industry News, Comments and more by Simon M. Shane

Advances in Epidemiology of Salmonella Contamination through the Broiler Production Chain


A recent article* addressed the epidemiology of Salmonella contamination in breeder flocks and subsequent contamination of processed product.  Records maintained by the USDA-Food Safety and Inspection Service demonstrated a decrease in the recovery from carcass and parts from 9.0 percent in 2016 to 6.6 percent in 2020.  The most recent data revealled an 11.2 percent contamination rate on parts and 4.8 percent on carcasses, presumably detected using whole- carcass wash.


The study showed differences in serovars according to area of production with S. Infantis and S. Typhimurium among Mid- Atlantic processors and a high proportion of S. Schwarzengrund in the Southeast quadrant of the broiler industry.


There is a disconnect between Salmonella serovars isolated from breeder flocks and the isolates recovered at processing.  This is evidenced by two-thirds of isolates from breeders yielding S. Kentucky that was not evident during processing.


Applying CRISPR-SeroSeq on breeder samples collected between 2020 and 2021 demonstrated an evident inability to identify all serovars in a sample using conventional microbiology. This is regarded as a restraint to evaluating public health risk.


An understanding of the epidemiology of the various Salmonella serovars that occur at the breeder and grow-out levels and their eventual prevalence on processed product is important since USDA-APHIS is considering pre-harvest modalities for suppression of Salmonella contamination entering plants.


*Siceloff, A.T. et al. Regional Salmonella Differences in United States Broiler Production from 2016 to 2020 and the Contribution of Multiserovar Populations to Salmonella Surveillance. Applied and Environmental Microbiology. doi: 10.1128/aem.00204-22. April 6, 2022.

Copyright © 2023 Simon M. Shane