Gross and Microscopic Lesions of Naturally Occurring Tuberculosis in a Captive Herd of Wapiti (Cervus Elaphus Nelsoni) in Colorado

Author:

Rhyan Jack C.1,Saari Dennis A.1,Williams Elizabeth S.2,Miller Michael W.3,Davis Arthur J.1,Wilson Arach J.1

Affiliation:

1. Pathobiology Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, PO Box 844, Ames, IA 50010

2. Wyoming State Veterinary Laboratory, Department of Veterinary Sciences, University of Wyoming, 1174 Snowy Range Road, Laramie, WY 82070

3. Colorado Division of Wildlife, Wildlife Research Center, 317 W. Prospect Road, Fort Collins, CO 80526

Abstract

A Mycobacterium bovis-infected herd of captive wapiti (Cervus elaphus nelsoni) in Colorado was depopulated after lesions of bovine tuberculosis were confirmed in 8 of 10 tuberculin skin test reactors. Of the 43 animals > 1 year of age, 26 had gross lesions suggestive of tuberculosis, 24 had microscopic lesions of tuberculosis, and 23 had acid-fast bacilli associated with the lesions. Lungs and retropharyngeal lymph nodes were the most frequently affected sites. Most lesions grossly and microscopically resembled tuberculosis in cattle; however, some lesions resembled abscesses or ovine caseous lymphadenitis lesions. Special stains and immunohistochemical techniques labeled few to numerous mycobacteria associated with the lesions.

Publisher

SAGE Publications

Subject

General Veterinary

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