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An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario

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Title: An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario
Author: Nham, Eric
Department: Department of Population Medicine
Program: Population Medicine
Advisor: Guerin, Michele
Abstract: An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario. This thesis is an investigation of prevalence, geographical distribution, and seasonal variation, and risk factors of avian reovirus (ARV)among commercial broiler chicken flocks in Ontario. Avian reovirus prevalence in the study population was 90.5%(95%confidence interval:86.8 to94.3%. Using univariable logistic regression models, statistically significant associations were identified between ARV presence and geographic district ( p = 0.012). There was no association between flock mortality and flock ELISA mean titre or PCR status. In the multivariable linearregression model and multi-level logistic regression model with flock as a random effect, co-infection with chicken anemia virus was associated with an increased risk of ARV infection. The season of grow- out was associated with the ARV mean titre, with significantly lower titres in the winter compared to the spring, summer, and autumn. Differences in ARV mean titres affiliated with feed mills supplying feed to the flocks were also identified.
URI: http://hdl.handle.net/10214/7758
Date: 2013-12


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