Tuberculosis in cattle caused by IS901+ Mycobacterium avium subsp. avium - a case report
2003
Ocepek, M. | Pate, M. (Veterinary Faculty, Ljubljana (Slovenia) | Zolnir-Dovc, M. | Cvetnic, Z.
An eight-year-old cow from a small herd showed a reaction to bovine tuberculin in two consecutive skin tests. The animal showing clinical signs related to tuberculosis was slaughtered for diagnostic purpose. The lungs were completely covered with disseminate tubercles of different sizes and the mediastinal lymph nodes were enlarged. Pneumonia granulomatosa tuberculosa and lymphadenitis hyperplastica chronica were diagnosed histologically. Mycobacterium avium subsp. avium of IS901+ and IS1245+ genotype was isolated from lungs and from the lymph node. Six weeks after the removal of the affected animal from the herd the skin test was performed on the remaining animals as follows: a single test with avian tuberculin in extensively reared poultry (n=12) and a comparative test with bovine and avian tuberculin in cattle (n=7). As the skin tests were negative, it is very likely that the cow did not transmit M. a. avium into the environment.
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