Atypical parasitic lesions in slaughtered cattle in Southern Brazil

Abstract

In this study, we described the morphological features and unusual presentations of hydatidosis, fasciolosis, and eosinophilic myositis caused by Sarcocystis species diagnosed at the slaughterhouse lines. Twenty-seven samples of atypical parasitic lesions from distinct cattle were evaluated, of which 12 corresponded to hydatidosis, 11 to fasciolosis, and 4 to eosinophilic sarcocystosis. Hydatid cysts were observed mainly in the heart, with all cases involving the left ventricle. Fasciolosis lesions involved mainly the lungs, and were characterized by a focal nodular elevated area involving the edges of the lobes. Intralesional trematodes were observed in three cases. Sarcocystosis lesions were observed in four cases, and lesions were primarily located in the skeletal and cardiac muscles. Grossly, they presented as focal or focally extensive streaks, patches, or numerous nodules that were greenish to mildly yellowish. Histologically, all the cases had intralesional ruptured cysts of Sarcocystis that were associated with severe eosinophilic myositis and myocarditis. Parasitic lesions in atypical locations and/or with aberrant responses should be promptly identified because it may mistakenly diagnosed as other potentially zoonotic diseases, such as cysticercosis and tuberculosis.

The Importance of the Slaughterhouse in Surveilling Animal and Public Health: A Systematic Review

“…These differences are probably related to the country of origin in which the studies were conducted. Likewise, the presence of hydatid cysts in the heart has been described as atypical location [ 88 ]. Although other causes of hearth condemnation, such as lymphoma or traumatic reticulopericarditis, have been described [ 84 ], the presence of C. bovis cyst in hearth was not reported as a major cause.…”