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Isolation of Rhodococcus equi and atypical mycobacteria from lymph nodes of pigs and cattle in herds with the occurrence of tuberculoid gross changes in the Czech Republic over the period of 1996-1998

DVORSKA L, PARMOVA I, LAVICKOVA M, BARTL J, VRBAS V , PAVLIK I
Veterinarni Medicina 44, 1999, 321-330

The prevalence of Rhodococcus equi and atypical mycobacteria in the lymph nodes of pigs (n = 1 382) and cattle (n = 231) without clinical signs was studied in the Czech Republic over the period 1996-1998. R. equi alone was isolated from 7.4% of pigs, and in a mixed infection with atypical mycobacteria in another 2.3% of pigs and 1.7% of cattle. The frequency of R. equi was higher (p = 0.01) in pigs than in cattle. Atypical mycobacteria alone were more frequently isolated from pigs - 37.2% positive findings than from cattle - 28.2% positive findings (p = 0.01). Of the total of 546 mycobacterial strains isolated from pigs, 96.2% belonged to the Mycobacterium avium complex, and 3.8% (21 strains) belonged to other species(5 strains M. chelonae, 6 strains M. terrae, 2 strains M. phlei, 6 strains M. forruitum and 2 strains not identified). A total of 65 mycobacterial strains belonging only to M. avium complex were identified in cattle. Of 492 pigs, R. equi alone was isolated from submaxillary lymph nodes at frequency of 19.5%, atypical mycobacteria were isolated at 30.1% and mixed infection at 4.9%. On the other hand, of the total of 639 pigs, R. equi alone was isolated from mesenteric lymph nodes in 0.5% of animals


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