Infection of cattle in Queensland with bluetongue viruses, 1. Prevalence of antibodies
1995
Ward, M.P. (Queensland Dept. of Primary Industries, Toowoomba (Australia).) | Flanagan, M. (Queensland Dept. of Primary Industries, Townsville (Australia)) | Baldock, F.C. (Queensland Dept. of Primary Industries, Moorooka (Australia). Animal Research Inst.)
A survey of nearly 20 000 cattle in Queensland was conducted to describe the prevalence and distribution of infection by serotypes of bluetongue virus. The overall prevalence of serum antibodies to one or more bluetongue viruses was 8.7 percent (95 percent confidence interval 8.3 to 9.1). Sera from cattle contained neutralising activity against 2 serotypes, 1 and 21. No evidence was found of infection with other serotypes previously isolated in Australia. The overall prevalence of serotype 1 antibodies was 7.7 percent (95 percent CI 7.3 to 8.0) and the prevalence of serotype 21 antibodies was 3.3 percent (95 percent CI 3.1 to 3.6). The prevalence of serotype 21 in every region of the State, except in the central highlands and south-west Queensland. Overall, 3 significantly different zones of prevalence were found: high prevalence (less than 20 percent) in far north Queensland, moderate (5 to 20 percent) in north-west, northern and southern coastal Queensland, and low (less than 5 percent) in the central highlands, Darling Downs and south-west Queensland.
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