Describing the Salmonella classification levels for low-volume production systems utilizing abattoir-based samples and classification stability over time
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The SafePork conference series began in 1996 to bring together international researchers, industry, and government agencies to discuss current Salmonella research and identify research needs pertaining to both pig and pork production. In subsequent years topics of research presented at these conferences expanded to include other chemical and biological hazards to pig and pork production.
The objective of this study was to compare estimates of the prevalence of meat-juice-based antibodies to Salmonella in swine originating from low-volume USA production systems (marketing s 8000 pigs per year) during 2002 and 2004. Meat samples were collected in concert with an established PRV monitoring system. Classification was established using the Danish Salmonella system. Forty-seven% of low-volume production systems did not change class from 2002 to 2004. However, 53% of systems did change class with most moving to higher observed seroprevalence in 2004. Salmonella seroprevalence was not stable within matched swine-production cohorts over time. Within-herd Salmonella seroprevalence was not stable over the reporting times. Classification of production-system status based on Salmonella antibody prevalence proved to be an unstable outcome.