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Prev Vet Med ; 189: 105282, 2021 Apr.
Article in English | MEDLINE | ID: mdl-33556799

ABSTRACT

Q fever is a zoonotic disease caused by infection with Coxiella burnetii transmitted from animals including, but not limited to, cattle, sheep and goats. The infection in cattle is typically sub-clinical with some evidence suggesting associated reproductive loss. There is currently limited data on the true prevalence and distribution of coxiellosis in beef cattle across northern Australia. During this study, 2,012 sera samples from beef cattle managed on commercial farms located in Queensland and the Northern Territory were tested using an indirect immunofluorescent assay (IFA) for serological evidence of IgG antibodies against C. burnetii. Bayesian latent class models were used to estimate the true prevalence, adjusted for diagnostic test sensitivity and specificity and incorporating the hierarchical structure of the cattle within farms and regions. In this study, cattle in the Northern Territory had lower estimated true prevalence than cattle within most regions of Queensland with the exception of south-east Queensland. Results from this study have described the geographic distribution and estimated the true prevalence of antibodies to C. burnetii in a sample of extensively managed beef cattle located across the tropical grazing regions of northern Australia.


Subject(s)
Cattle Diseases , Coxiella burnetii , Q Fever , Animals , Antibodies, Bacterial , Bayes Theorem , Cattle , Cattle Diseases/diagnosis , Cattle Diseases/epidemiology , Coxiella burnetii/immunology , Diagnostic Tests, Routine/veterinary , Enzyme-Linked Immunosorbent Assay/veterinary , Northern Territory , Prevalence , Q Fever/diagnosis , Q Fever/epidemiology , Q Fever/veterinary , Queensland , Seroepidemiologic Studies , Uncertainty
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