Cross-sectional risk factor analysis for Yersinia enterocolitica 0:3 in Danish slaughter pigs based on bacteriological data

This study aimed at identifying major risk factors for infection with Yersinia enterocolitica serotype 0:3 (Y enterocolitica 0:3) in Danish slaughter pigs. Fecal samples from finishers in 67 herds were cultured for presence of Yersinia. Herd informations were obtained from a questionnaire. Risk factors for Y. enterocolitica 0:3 positive herd status and within-herd prevalence was identified by multivariate logistic regression. Factors indicating low biosecurity (purchase of pigs, conventional and larger herds, no use of separate load-out-room) were major risk factors for Y enterocolitica 0:3 infection. Feeding wet feed did not influence the infection. Feeding home mixed feed vs. purchased feed, which is an important risk factor and intervention tool for reduction of Salmonella, only influenced the within-herd prevalence. The results indicate that a separate intervention strategy against Y enterocolitica in pig herds might be needed

Salmonella Control Programs in Denmark

We describe Salmonella control programs of broiler chickens, layer hens, and pigs in Denmark. Major reductions in the incidence of foodborne human salmonellosis have occurred by integrated control of farms and food processing plants. Disease control has been achieved by monitoring the herds and flocks, eliminating infected animals, and diversifying animals (animals and products are processed differently depending on Salmonella status) and animal food products according to the determined risk. In 2001, the Danish society saved U.S.$25.5 million by controlling Salmonella. The total annual Salmonella control costs in year 2001 were U.S.$14.1 million (U.S.$0.075/kg of pork and U.S.$0.02/kg of broiler or egg). These costs are paid almost exclusively by the industry. The control principles described are applicable to most industrialized countries with modern intensive farming systems