Evaluation of lymphocyte stimulation tests for diagnosis of bovine tuberculosis in elk (Cervus elaphus).
Lymphocyte stimulation tests (LST), performed using 6 antigen preparations, were compared individually and in pairs. The tests were performed on 433 blood samples collected from elk in Mycobacterium bovis-infected herds. These elk were killed as part of Agriculture and Agri-Food Canada's bovine tuberculosis eradication policy, and mycobacterial culture results were obtained from tissues of each animal. The LST, which had the highest total sum of sensitivity and specificity, was a comparative test that used M bovis purified protein derivative (PPD) and M paratuberculosis (johnin) PPD. This test had a sensitivity of 76%, with confidence limits (CL) of 63 to 85% for this estimate, and specificity of 77% (CL, 72 to 81%). The LST, using only M bovis PPD antigen, had a sensitivity of 70% (CL, 57 to 80%) and specificity of 74% (CL, 69 to 79%); when it was compared with culture results, using the kappa statistic, agreement was only 32%. This indicated that the LST identified different elk than did M bovis isolation tests.
Hutchings
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Agriculture and Agri-Food Canada, Animal Diseases Research Institute, Nepean, Ontario.
Wilson
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D000818:Animals; D003670:Deer / Q000276:immunology / Q000382:microbiology*; D005260:Female; D008213:Lymphocyte Activation; D009163:Mycobacterium bovis / Q000276:immunology*; D012372:ROC Curve; D012015:Reference Standards; D012680:Sensitivity and Specificity; D014376:Tuberculosis / Q000175:diagnosis / Q000662:veterinary*