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.