A pathological study was carried out in different helminth parasite infection organs in 110 animals during the period from 2010 to 2016. Histopathological examination of hydatid cysts in the liver, showed extensive fibrous connective tissue proliferation with eosinophilic and lymphocytic infiltration, in lung, parenchyma showed severe emphysema with infiltration of alveolar macrophages and lymphocytes infiltration. In infection, polymorphonuclear infiltration in the sub-mucosa with hyper activity of goblet cells leading to occlusion of the gland was noted in the tissue sections. In amphistomiasis, intestinal mucosa showed diffuse hyperemia, thickening and ulceration. Petechiae were observed in the anterior part of the duodenum and jejunum. Presence of parasites in the abomasum revealed petechial haemorrhages on the mucousa. In infection, the rectum showed hypertrophy, hyperplasia and hyperactivity of the goblet cells. In some places there is focal aggregation of mononuclear cells.

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