Publications

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occurrence of mycobacterium avium subspecies paratuberculosis and neospora caninum in alberta cow-calf operations.mycobacterium avium subsp. paratuberculosis (map) and neospora caninum (nc) are two pathogens causing important production limiting diseases in the cattle industry. significant impacts of map and nc have been reported on dairy cattle herds, but little is known about the importance, risk factors and transmission patterns in western canadian cow-calf herds. in this cross-sectional study, the prevalence of map and nc infection in southwest alberta cow-calf herds was estimated, risk factors for nc w ...201425277685
pathogens at the livestock-wildlife interface in western alberta: does transmission route matter?in southwestern alberta, interactions between beef cattle and free-ranging elk (cervus elaphus) may provide opportunities for pathogen transmission. to assess the importance of the transmission route on the potential for interspecies transmission, we conducted a cross-sectional study on four endemic livestock pathogens with three different transmission routes: bovine viral diarrhea virus and bovine herpesvirus 1 (predominantly direct transmission), mycobacterium avium subsp. paratuberculosis (ma ...201424517283
bayesian kriging of seroprevalence to mycobacterium avium subspecies paratuberculosis and neospora caninum in alberta beef and dairy cattle.identifying spatial patterns of risk is important in the study of diseases with ecologic causes. furthermore, relatively complex hierarchical modeling is required to determine how factors that are organized across levels interact, such as how an ecologic cause interacts with farm management and with animal characteristics. the objective of this study was to map the risk for mycobacterium avium subspecies paratuberculosis (map - the causative agent of johne's disease) and neospora caninum (nc - t ...200718189052
seroprevalence of and agroecological risk factors for mycobacterium avium subspecies paratuberculosis and neospora caninum infection among adult beef cattle in cow-calf herds in alberta, canada.a province-wide cross-sectional seroprevalence and agroecological risk factor study of mycobacterium avium subspecies paratuberculosis (map) and neospora caninum (nc) infection among cattle in 100 cow-calf herds in alberta was conducted. the seroprevalence of map in adult cattle was 1.5% across all herds. using a widely accepted herd test cutpoint of 2 or more seropositive cows out of 30 animals tested, 7.9% of herds were estimated to be infected (95% confidence interval (ci): 2.3-23.4%). seropr ...200717494367
seroprevalence of mycobacterium avium subspecies paratuberculosis, neospora caninum, bovine leukemia virus, and bovine viral diarrhea virus infection among dairy cattle and herds in alberta and agroecological risk factors associated with seropositivity.a province-wide, cross-sectional seroprevalence and agroecological risk factor study of mycobacterium avium subspecies paratuberculosis (map), neospora caninum (nc), bovine leukemia virus (blv), and bovine viral diarrhea virus (bvdv) genotypes 1 and 2 (bvdv1 and bvdv2) infection in dairy cattle herds in alberta was conducted. among adults, the seroprevalence of map, nc, and blv was 9.1%, 18.5%, and 26.9%, respectively. for map, based on a herd test cutpoint of 2 or more seropositive cows, 58.8% ...200617078247
mycobacterium paratuberculosis in dairy herds in alberta.fifty dairy herds in alberta were tested for the presence of mycobacterium paratuberculosis by fecal culture and serum enzyme linked immunosorbent assay (elisa). individual sera (1500) were tested for antibodies to m. paratuberculosis by elisa. fecal samples were combined in pools of 3 (10 pools/herd) for a total of 500 pools that were cultured for m. paratuberculosis. thirty cultures, including all 10 pools from 1 herd, were not readable due to fungal contamination. the remaining 470 cultures, ...200312677691
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