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prevalence of serum antibodies to mycobacterium avium subsp. paratuberculosis in cattle in galicia (northwest spain).prior to establishing a control and prevention program for johne's disease in cattle in galicia (northwest spain), a survey was conducted to estimate the prevalence of the disease. for this survey, 61,069 animals of at least 1-year of age from 2735 randomly selected herds were bled and samples analyzed with a commercial elisa. the estimated true individual-level prevalences--assuming the manufacturer's reported test sensitivity of 48.5% and specificity of 98.9%--were 3.02% in dairy cattle, 1.03% ...200717928078
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