By
Charles O. Thoen, DVM, PhD, 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.
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