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  • 1 Institute of Microbiology and Parasitology, Veterinary Faculty Ljubljana Gerbičeva 60, 1000 Ljubljana, Slovenia
  • 2 Institute of Microbiology and Parasitology, Veterinary Faculty Ljubljana Gerbi ičeva 60, 1000 Ljubljana, Slovenia
  • 3 Institute of Microbiology and Parasitology, Veterinary Faculty Ljubljana Gerbi ičeva 60, 1000 Ljubljana, Slovenia
  • 4 Institute of Microbiology and Parasitology, Veterinary Faculty Ljubljana Gerbi ičeva 60, 1000 Ljubljana, Slovenia
  • 5 Institute of Microbiology and Parasitology, Veterinary Faculty Ljubljana Gerbi ičeva 60, 1000 Ljubljana, Slovenia
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Granulomatous lesions in bovine and especially swine lymph nodes are still frequently observed during routine veterinary meat inspections even though Mycobacterium bovis infections are no longer detected in domestic animals in Slovenia. Different lymph nodes of pigs (n = 260) were investigated using classical bacteriological and molecular methods. Mycobacterium avium alone was isolated in 47.3% of pigs and in mixed infection with Rhodococcus equi in 3.9% of pigs. R. equi alone was isolated in 27.3% and in mixed infection with mycobacteria other than M. avium in 1.5% of pigs. A total of 133 M. avium isolates were typed using the IS1245, IS901 and FR300 PCR. Almost two thirds (60.9%) of isolates belonged to M. avium hominissuis (IS901-, IS1245+ genotype), 33.8% of isolates belonged to M. avium avium (IS901+, IS1245+ genotype) and 5.3% of isolates remained non-typed. Fifty out of 85 R. equi isolates were tested for the virulence-associated antigens (VapA and VapB). Nearly two thirds (60.0%) were positive for VapB while all the other isolates were VapA- and VapB-negative.

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