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Reduction of Enteropathogenic Yersinia in the Pig Slaughterhouse by Using Bagging of the Rectum

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Abstract:

To evaluate the effectiveness of bagging of the rectum in mitigating the contamination of carcasses with enteropathogenic Yersinia at the slaughterhouse and to estimate the hidden prevalences of these pathogens in different farm types and capacities, samples from pigs, carcasses, and slaughterhouse environment were collected, and a Bayesian probability model was constructed. In addition, the contamination routes were studied with molecular typing of the isolated strains. According to the model, bagging of the rectum reduced carcass contamination significantly with pathogenic Yersinia enterocolitica, but not with Yersinia pseudotuberculosis, and alone it was insufficient to completely prevent the carcass contamination with enteropathogenic Yersinia. The hidden prevalence of pathogenic Y. enterocolitica was higher at high production capacity than it was in low production capacity, but the 95 % credible intervals overlapped. Slaughterhouse environments can contaminate carcasses with enteropathogenic Yersinia, but the plausible main contamination source is the pig carrying the pathogen.

Document Type: Research Article

Affiliations: 1: Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014 Helsinki University, Finland;, Email: riikka.laukkanen@helsinki.fi 2: Risk Assessment Unit, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790 Helsinki, Finland 19157170 3: Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014 Helsinki University, Finland 4: Microbiology Unit, Research Department, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790 Helsinki, Finland 19157170 5: Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 66, 00014 Helsinki University, Finland, Meat Inspection Unit, Finnish Food Safety Authority Evira, Mustialankatu 3, 00790 Helsinki, Finland 19157170, City of Espoo, P.O. Box 210, 02070 Espoo, Finland

Publication date: December 1, 2010

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