Abstract
This study surveys 2,593,348 cattle slaughtered between 1996 and 2000, and further investigates 571 (0.02%) animals found to have tuberculous lesions. Culture of 346 randomly selected tissue samples from animals younger ( n=215) and older ( n=131) than 2 years, isolated mycobacteria from 91 animals (26.3%). These included 74 Mycobacterium avium subsp. avium isolates of IS 901+ and IS 1245+ genotype and serotype 2, 13 M. avium subsp. hominissuis isolates of IS 901− and IS 1245+ genotype and serotypes 8 ( n=7) and 4 ( n=6), two M. chelonae, one M. avium subsp. paratuberculosis (RFLP type B-C1), and one M. terrae. Culture of mesenteric lymph node samples obtained 66 isolates of M. avium complex ( MAC) and four isolates of other mycobacterial species. M. bovis was significantly absent from all samples. Mycobacteria were more frequently ( P=0.01) isolated from tissues of animals under 2 years (34.4%) than animals over 2 years (13.0%). IS 901 and IS 1245 RFLP methods were used to type 17 randomly selected MAC isolates, virulent after intramuscular inoculation of pullets, from 17 different cattle herds. These revealed 11 distinct IS 901 RFLP types and three IS 1245 RFLP profiles. Polyclonal infection of individual animals was detected by IS 901/IS 1245 typing in 2 of the 17 selected isolates.
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