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Cysticercus ovis in Canadian sheep: risk factors and a transmission model to assess control measures

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dc.contributor.advisor Menzies, Paula
dc.contributor.advisor Jones, Andria
dc.contributor.author De Wolf, Bradley
dc.date.accessioned 2011-08-26T15:44:47Z
dc.date.available 2011-08-26T15:44:47Z
dc.date.copyright 2011-08
dc.date.created 2011-08-11
dc.date.issued 2011-08-26
dc.identifier.uri http://hdl.handle.net/10214/2883
dc.description.abstract This thesis investigated the epidemiology and control of Cysticercus ovis infection on Canadian sheep farms. Canadian slaughter data indicated an increase in sheep carcass condemnations due to C. ovis in 2007 and 2008. Trace-back of 237 carcasses condemned in Ontario, between 2009 and 2011, revealed they originated from 133 farms across Canada. A case-control study was performed (n=40 cases, 56 controls) to identify farm-level risk factors for carcass condemnations. Farm dogs scavenging deadstock (OR=4.04; 95% CI: 1.16–14.04) and failing to dispose of deadstock properly (OR=11.78; 95% CI: 2.93–47.40) were significantly associated with condemnations in multivariable analyses. A transmission model for Taenia ovis was created and control options were assessed. Model simulations predicted cestocide treatment of guardian dogs every fifth week, and proper deadstock disposal would reduce the risk of C. ovis infection in lambs. en_US
dc.language.iso en en_US
dc.subject Cysticercus ovis en_US
dc.subject sheep en_US
dc.subject Canada en_US
dc.subject risk factors en_US
dc.subject mathematical modelling en_US
dc.title Cysticercus ovis in Canadian sheep: risk factors and a transmission model to assess control measures en_US
dc.type Thesis en_US
dc.degree.programme Population Medicine en_US
dc.degree.name Master of Science en_US
dc.degree.department Population Medicine en_US


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