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Tuberculosis in Horses

By Charles O. Thoen, DVM, PhD, Professor, Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University

Horses are relatively resistant to tuberculosis caused by Mycobacterium tuberculosis; however, they are susceptible to M bovis. When tuberculosis does develop, tuberculous, noncalcified lesions are often found in the liver, mesenteric lymph nodes, lungs, and other sites. Tuberculin test results are rather erratic.