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Abstract The present study was designed for more understanding of the pathological effects of internal helminthic parasites of native Egyptian sheep, slaughtered at AI_ Moneeb abattoir, Giza-Govemorate, Egypt, on the gastrointestinal tract and the cellular reactions against them. Gastrointestinal helminthic parasites of sheep, naturally challenged, elicit cellular reactions in the tissues causing varying degrees of impact on the infected tissues. Nematode infections have the greatest impact on the tissues of gastrointestinal tract. Nematodes: Haemonchus contortus, Trichostrongylus ssp and Cooperia spp. cause a various gross lesions in the gastrointestinal tract. Cestode infections of sheep were common and all of them, Moniezia spp., Stilesia spp. and Avitellina spp. share almost the same gross pathology which is generally little and not specific. Microscopically, the cellular inflammatory reactions associated with the Haemonchus contortus infections involving cellular infiltration of eosinophils and mononuclear cells and the abomasal mucosa showed varying degrees of degeneration to necrosis, with the appearance of cross sections of probably H contortus developing larval stages, mucosal hypertrophy, mucous cells hyperplasia, mucosal and submucosal edema, The most predominant inflammatory cells observed microscopically in all specimens, which play a role in eliciting and leading the reactions against H contortus were eosinophils, lymphocytes, mast cells and/or globule leukocytes. |