Abstract
The gross abnormalities in the intestines of 10 horses with a history of chronic weight loss varied greatly. The principal microscopic change was granulomatous inflammation characterized by lymphocytes, plasma cells, macrophages, epithelioid cells and giant cells. Mycobacterium tuberculosis, avian type, was isolated from the gut content of one horse, but no cause was found in the others. Horses previously reported to have tuberculosis had lesions similar to those described here. These lesions are also similar to those in Crohn's disease of man.
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