Abstract

MARGINEDA, C.A. et al. Listeriosis en bovinos de la Provincia de Buenos Aires, Argentina. Rev. vet. [online]. 2012, vol.23, n.1, pp.32-37. ISSN 1669-6840.

A retrospective study of bovine listeriosis cases occurring in different counties of Buenos Aires Province (Argentina) was made. Diagnosis was performed by histopathology, bacteriology and immunohistochemistry. From 17 positive cases confirmed by immunohistochemistry, samples were available only in 7 for bacteriological study, and Listeria monocytogenes was isolated only in 3 of them. Of all the cases, 64.7% were associated with the consumption of corn silage. The disease was most frequently diagnosed in intensive production systems, such as feedlot and dairy herds. One of the isolated strains of L. monocytogenes was resistant to rifampicin and sulfonamides. After immunohistochemistry, L. monocytogenes positive labeling was observed in 4 cases with previous negative bacteriological isolation. Immunohistochemistry proved to be a valuable technique and improved the diagnosis of bovine listeriosis

Keywords : cattle; Listeria monocytogenes; immunohistochemistry; Argentina.

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