A Cross-sectional Study of Bovine Tuberculosis in Dairy Farms in Asmara,Eritrea |
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Authors: | Omer M.K. Skjerve E. Woldehiwet Z. Holstad G. |
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Affiliation: | (1) College of Agriculture, University of Asmara, PO Box 1220, Eritrea;(2) Department of Pharmacology, Microbiology and Food Hygiene, Norwegian School of Veterinary Science, PO Box 8146 Dep., N-0033 Oslo, Norway;(3) Department of Veterinary Pathology, University of Liverpool, L69 3BX Liverpool, UK;(4) National Veterinary Institute, PO Box 8156 Dep., N-0033 Oslo, Norway |
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Abstract: | Bovine tuberculosis in dairy cattle in Asmara, Eritrea, was studied using a cross-sectional study to describe its prevalence and to identify factors associated with it. A total of 72 randomly selected herds were included in the study. The comparative intradermal tuberculin test was used for the diagnosis. Of 1813 individual animals tested, 14.5% were reactors. Thirty herds (41.7%) had at least one reactor but, by defining a reactor herd as any herd with two or more reactors, only 19 (26.4%) herds were classified as reactor herds. Based upon individual animal specificity of 98.5%, the calculated herd specificity was >99%. A multiple logistic model showed that the presence of exotic breeds was associated with a high risk (odds ratio = 5.70; 95% confidence interval 1.13–28.8). An increased risk was also linked to large herds. Keeping the animals always indoors reduced the risk, but could not be fitted to the model owing to empty cells. |
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Keywords: | breed cattle dairy epidemiology herd size housing Mycobacterium bovis tuberculin |
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