Factors associated with the detection of bacterial pathogens in the Ontario Provincial fish disease surveillance program

dc.contributor.advisorThorburn, M.A.
dc.contributor.authorGood, Christopher Michael
dc.date.accessioned2020-12-03T15:26:15Z
dc.date.available2020-12-03T15:26:15Z
dc.date.copyright1999
dc.degree.departmentDepartment of Population Medicineen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractThis thesis presents an investigation into Ontario Ministry of Natural Resources Fish Health Laboratory data from 1981-1997, to determine risk factors associated with lot-level detection of 'Aeromonas salmonicida ' and 'Yersinia ruckeri' in hatchery fish and to simulate monitoring efficacy in the absence of routine screening for these pathogens. Using stepwise logistic regression modeling, brook trout and back-cross were significantly more likely to test 'A. salmonicida'-positive, and brook trout were significantly more likely to test 'Y. ruckeri '-positive. For both pathogens, the 1-5 month age group was significantly associated with detection. The impact of eliminating routine screening was evaluated using Monte Carlo simulations. The mean probabilities that a hatchery would be pathogen-free if no asymptomatic lots were screened and all diseased lots tested negative for 'A. salmonicida' and 'Y. ruckeri' were 0.987 and 0.986, respectively, indicating acceptable monitoring efficacy. However, limitations of the theoretical monitoring model must be considered.en_US
dc.identifier.urihttps://hdl.handle.net/10214/21712
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectdisease detectionen_US
dc.subjectrisk factorsen_US
dc.subjectlot-level detectionen_US
dc.subjectAeromonas salmonicidaen_US
dc.subjectYersinia ruckeren_US
dc.subjecthatchery fishen_US
dc.subjectmonitoring efficacyen_US
dc.subjectpathogensen_US
dc.titleFactors associated with the detection of bacterial pathogens in the Ontario Provincial fish disease surveillance programen_US
dc.typeThesisen_US

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