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Year 2013 - Volume 33, Number 11
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Eosinophilic myositis in cattle slaughtered for human consumption, 33(11):1345-1348
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ABSTRACT.- Tessele B., Vielmo A., Panziera W., Gomes D.C & Barros C.S.L. 2013. [Eosinophilic myositis in cattle slaughtered for human consumption.] Miosite eosinofílica em bovinos abatidos para consumo humano. Pesquisa Veterinária Brasileira 33(11):1345-1348. Departamento de Patologia, Universidade Federal de Santa Maria, Camobi, Santa Maria, RS 97105-900, Brazil. E-mail: claudioslbarros@uol.com.br
Eosinophilic myositis is a relatively rare inflammatory condition affecting striated muscle of cattle and sheep. It has been usually associated with degenerating cysts of Sarcocystis spp., mainly S. cruzi, although this protozoan occurs in the myofibers of almost every cattle without provoking an inflammatory reaction. This paper reports the gross and histopathological findings of eosinophilic myositis in three cattle slaughtered for meat production for human consumption. Grossly lesions were pale yellow, occasionally with a greenish hue, 2-6mm spots or strikes in the myocardium of the three cattle and in the masseter muscle of one of them. Microscopically there were granulomatous lesions surrounding a core of dead and degenerating eosinophils and occasional fragment components of Sarcocystis. Immunohistochemistry performed with a policlonal anti-Neospora caninum antibody in the myocardium of one of the cattle marked intact cysts in normal myofibers and intralesional fragments of disrupted cyst amidst areas with strong inflammatory reaction. This latter finding corroborates the opinion of those in favor of Sarcocystis spp. playing a role in the causation of eosinophilic myositis. |
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