Abstract
Three samples of fertile hydatid cysts and 3 other sterile were collected from sheep liver and 3 samples of sterile hydatid cysts from cows liver. Infected liver samples with hydatid cyst were obtained from meat seal shops in AL-Muthanna province in December 2010, then measured dimensions of cysts and calculated the quantity of hydatid fluid and viability of protoscolices by staining with eosin stain then examining under a light microscope of 40x. petechial hemorrhage and paleness around cysts were important gross lesions in sheep in addition to calcification in cow hydatid cysts, on another hand the histological lesions were thickened fibrous layer and severe necrosis with infiltrations of eosinophils and extensive calcification in cows liver. There was a significant effect of the amount of hydatid cyst, thickness of the fibrous layer and thickness of the necrotic layer.
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