Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 7/20/2003
Publication Date: 9/15/2003
Citation: Bush, E., Wesley, I.V., Bhaduri, S. 2003. Risk factors for yersinia enterocolitica on u.s. swine farms in 2000. Meeting Abstract. p.54-56 Interpretive Summary:
Technical Abstract: The NAHMS Swine 2000 study was conducted in the top 17 swine producing states to determine the animal prevalence of Yersinia enterocolitica. Producers were randomly selected and their participation solicited for various portions of the study. Questionnaires were used to obtain management data regarding feed management, environmental conditions, vaccination policies, and other factors. Fecal samples were collected from 129 sites, 50 samples per site from 10 pens with late finishers. Tonsil swabs were taken from 12 late finishing pigs per site on 115 sites. A total of 2664 fecal samples and 1180 tonsil swabs were screened for ail the gene by PCR. Positive samples were placed in ITC broth and on CIN agar and results were merged with these questionnaire data. Half of the sites (58/115) were classified as positive. A logistic regression model was constructed for each variable which passed the screening cut-off p value of <0.25 controlling for region. Final factors associated with positive farm status for Yersinia enterocolitica (ail+) included inclusion of bone meal in finisher diet, any grower/finisher deaths due to scours, and vaccination for E coli.