|
|||||
|
|
Prevalence of serum antibodies to Mycobacterium avium subsp. paratuberculosis in cattle in Galicia (northwest Spain) |
|
| Authors: | Diéguez Francisco J Arnaiz Ignacio Sanjuán María L Vilar María J López Manuel Yus Eduardo |
| Institution: | aEpidemiology and Animal Health Unit, Institute of Food Analysis and Research, Santiago de Compostela University, Campus Universitario s/n, 27002 Lugo, Spain bAnimal Health and Production Laboratory of Galicia, Av. Madrid 77, 27002 Lugo, Spain |
| Abstract: | 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% in beef cattle and 2.83% in animals from farms with both dairy and beef cattle. True herd prevalences (with herds declared positive if one or more animals tested positive) were 10.69% for dairy herds, 0% for beef herds and 2.71% for mixed herds. When herds were declared positive if at least two animals tested positive, true herd prevalences were 14.75% for dairy herds, 1.47% for beef herds and 12.01% for mixed herds. Assuming a higher specificity of 99.4%, true individual-level prevalences increased to 4.03% in dairy herds, 2.07% in beef herds and 3.84% in mixed herds. Herd prevalences were 27.77%/18.79%, 2.78%/2.40% and 5.70%/12.24% (using the one/two-animal cut-offs) in dairy, beef and mixed herds, respectively. In conclusion, these results seem to indicate that a small percentage of cows and a rather high percentage of dairy herds in this region are MAP-seropositive. |
| Keywords: | Cattle Johne's disease Prevalence |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ | |