Mycobacterium avium subsp. paratuberculosis (MAP) is the etiological agents of paratuberculosis, a chronic and contagious enteric disease of ruminants. Economic losses and the potential role of MAP in Crohn’s disease in humans, justify the study of paratuberculosis. Management practices that limit exposure of susceptible animals to MAP are more effective at reducing disease prevalence than testing and culling infected cows. The objective of this retrospective case-control study was to study the association between management practices and MAP status in dairy herds in Québec. Twenty-six case herds (MAP isolated from at least 1 environmental sample) and 91 control herds (no clinical cases of paratuberculosis and negative on 2 consecutive yearly environmental samplings) were selected among herds enrolled in the Québec Voluntary Paratuberculosis Control Program. Exposure was measured using a risk assessment questionnaire, completed at enrolment. Culture of MAP was achieved using the BACTEC 960 detection system. Multivariable logistic regression was used to evaluate the association between risk factors and MAP herd status. Herd size was significantly associated with a positive MAP herd status (OR = 1.17; 95 % CI: 1.02 - 1.33). Farms buying more than 4 % of the cows in their herds per year in the last 5 years have significantly greater odds of being MAP positive compared to closed herds (OR = 5.44; 95 % CI: 1.23 - 23.98). These risk factors are consistent with the literature and should be prioritized in control programs.
Resident in large animal internal medicine, major bovine
Université de Montréal - Faculté de médecine vétérinaire
Thursday, June 14
10:15 AM – 10:30 AM
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