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Atypical mycobacteria isolated from intestinal lesions of bovine oesophagostomosis

Atypical mycobacteria isolated from intestinal lesions of bovine oesophagostomosis

Pesquisa Veterinaria Brasileira 7(1): 7-10

It was found that 90% of 1 to 9 year old cattle from southwestern Brazil had nodular intestinal lesions of Oesophagostomosis in the final portion of the ileum and in the cecum. The number of nodules varied from 1 to 53 and their diameter from 1 to 19 mm. The cut surface of the larger nodules showed a dry yellowish caseous material, and sometimes fragments of Oesophagostomum radiatum larvae could be observed. Bacteriological examination of 400 samples taken from the intestinal wall with and without lesions resulted in isolation of 42 (5.2%) cultures of atypical mycobacteria. Thirty cultures originated (71.4%) from nodular material and 12 (28.6%) from the portion without lesion. Twenty three (54.8%) cultures belonged to the Runyon group IV and 19 (45.2%) to group II and III. There were 4 cultures of Mycobacterium scrofulaceum, 7 of the M. terrae-complex and 8 of M. intracellulare. Fifteen (78.9%) of these cultures were isolated from the nodular lesions and only 4 (21.0%) from the part without nodules. The present results suggest that the nodular lesion caused by Oesophagostomum radiatum larvae is a predisposing factor for the penetration and multiplication of atypical mycobacteria in the intestinal wall. Consequently inespecific allergic reactions to tuberculinization may develop.

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Accession: 004797617

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