Show simple item record Beck, Melissa A. Colwell, Douglas D. Goater, Cameron P. Kienzle, Stefan W. 2017-03-23T23:23:18Z 2017-03-23T23:23:18Z 2015
dc.identifier.citation Beck, M. A., Colwell, D. D., Goater, C. P., & Kienzle, S. W. (2015). Where's the risk?: Landscape epidemiology of gastrointestinal parasitism in Alberta beef cattle. Parasites & Vectors, 8(34). doi:10.1186/s13071-015-1040-x en_US
dc.description Sherpa Romeo green journal; open access en_US
dc.description.abstract Background: Gastrointenstinal nematodes (GIN) present a serious challenge to the health and productivity of grazing stock around the globe. However, the epidemiology of GIN transmission remains poorly understood in northern climates. Combining use of serological diagnostics, GIS mapping technology, and geospatial statistics, we evaluated ecological covariates of spatial and temporal variability in GIN transmission among bovine calves pastured in Alberta, Canada. Methods: Sera were collected from 1000 beef calves across Alberta, Canada over three consecutive years (2008–2010) and analyzed for presence of anti-GIN antibodies using the SVANOVIR Ostertagia osteragi-Ab ELISA kit. Using a GIS and Bayesian multivariate spatial statistics, we evaluated the degree to which variation in specific environmental covariates (e.g. moisture, humidity, temperature) was associated with variation in spatial and temporal heterogeneity in exposure to GIN (Nematodirus and other trichostrongyles, primarily Ostertagia and Cooperia). Results: Variation in growing degree days above a base temperature of 5 °C, humidity, air temperature, and accumulated precipitation were found to be significant predictors of broad–scale spatial and temporal variation in serum antibody concentrations. Risk model projections identified that while transmission in cattle from southeastern and northwestern Alberta was relatively low in all years, rate of GIN transmission was generally higher in the central region of Alberta. Conclusions: The spatial variability in risk is attributed to higher average humidity, precipitation and moderate temperatures in the central region of Alberta in comparison with the hot, dry southeastern corner of the province and the cool, dry northwestern corner. Although more targeted sampling is needed to improve model accuracy, our projections represent an important step towards tying treatment recommendations to actual risk of infection. en_US
dc.language.iso en_US en_US
dc.publisher Biomed Central Ltd en_US
dc.subject Gastrointestinal nematodes en_US
dc.subject GIS en_US
dc.subject Bayesian en_US
dc.subject Multivariate hierarchical models en_US
dc.subject Beef cattle en_US
dc.subject Alberta en_US
dc.title Where's the risk? : Landscape epidemiology of gastrointestinal parasitism in Alberta beef cattle en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Biological Sciences en_US
dc.publisher.department Department of Geography en_US
dc.description.peer-review Yes en_US
dc.publisher.institution University of Lethbridge en_US
dc.publisher.institution Lethbridge Research Centre en_US

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