Monitoring the Dynamics of Salmonella Prevalence in Commercial Swine Herds

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2001-01-01
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Gibson, K.
Ritter, L.
Blaha, Thomas
Carlson, A.
Szaszák, Á.
Maes, Dominiek
Grass, Julie
Harris-Turney, Isabel
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International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork
Iowa State University Conferences and Symposia

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.

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The goal of this study was to monitor 47 commercial swine herds at slaughter to determine Salmonella prevalence over a 2 year period. Mesenteric lymph nodes were collected (n=60, pooled 5:1 for a total of 12 samples) at the time of slaughter and cultured. Tissue samples were collected from the diaphragm and tested by ELISA. After a first phase of testing, we identified 10 herds that had both low culture positives and low average ELISA OD values. We also identified 10 herds that had both a high culture positives and high average ELISA OD values. The purpose of testing during Phase II was to see if the I 0 "low" herds remained low and the I 0 "high" herds remained high. The findings confirm the need for an on-going monitoring for tracking the changing Salmonella prevalence of swine herds over time.

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