Através técnicas de rotina para histopatologia foram examinados fígados de bovinos, bubalinos e ovinos infectados por Fasciola hepatica. As colorações utilizadas foram Hematoxilina- Eosina, Tricrômico de Schorr, Tricrômico de Mallory e Azul de Toluidina. As principais lesões observadas foram cortes de parasitas em ductos biliares, fibrose portal, hiperplasia de ducto biliar, fibrose de parede de ducto biliar e infiltração por linfócitos, plasmócitos, eosinófilos e neutrófilos. Lesões de ductos biliares mais calibrosos são observados mais acentuadamente em bovinos e bubalinos que em ovinos. No entanto, a eosinofilia está presente de forma mais acentuada em ovinos que nas demais espécies. Comparando os resultados obtidos, conclui-se que a fasciolose em bovinos e bubalinos se trata de uma doença crônica. Nos ovinos o predomínio de eosinófilos caracteriza fase inicial de fasciolose crônica. Hepatopathology of infection by Fasciola hepatica in cattle, buffaloes and sheep Abstract A histopathological study on hepatic lesions caused by Fasciola hepatica has been carried out three domestic ruminants: cattle, buffalos and sheep. Liver samples were processed by routine histological methods. The staining procedures included hematoxilin-eosine, Schorr (triple staining), Mallory (triple staining) and toluidine blue. The most frequent lesions found were the following ones: parasite sections inside the billiary ducts, portal system fibrosis and billiary duct hyperplasia. Lymphocytes, plasmocytes, eosinophils and neutrophils, characteristics of a chronic disease, were found in bovines and bubalines. The presence of eosinophils in sheeps was characteristic of the initial phase of a chronic fascioliasis.
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