These observations resulted in the diagnosis of bovine nodular thelitis. Mycobacterial culture was not attempted because of its inherent difficulty (3).
lepromatosis, the causative agents of tuberculoid and lepromatous leprosy, and a diffuse form of lepromatous leprosy (10.11), respectively, was characterized in cows with bovine nodular thelitis. M.
The natural habitat of the causative agent of bovine nodular thelitis is unknown, and zoonotic transmission had never been observed in breeder cows.