A new species of the genus Lutziella (Rohde, 1966) Yamaguti, 1971 is described here and named Lutziella swatensis sp.nov. from the liver of rat (Rattus rattus L.). The new species is characterized by having body flat, smooth, longer than broad with maximum width at the level of the ovary, oral sucker with weak musculature, pharynx small; eosophagus long; caeca of irregular shape which bifurcate on the anterior border of the ovary in to unequal portions, acetabulum weakly muscular, post-testicular, testes lobed, cirrus pouch somewhat median, small in size containing winding seminal vesicle, prostatic complex and short ejaculatory duct. Genital pore median. Ovary post testicular, submedian; seminal receptacle overlapping ovary, laurer’s canal present. Vitellaria follicular extending on each side from almost the level of testes to anterior portion of posterior half of the body. Uterus filled with eggs occupying most of the body, eggs oval rather small, numerous, brownish in colour, excretory vesicle tubular with terminal pore. Lutziella swatensis n. sp. is the second species of the genus known from Pakistan as well as the second species described from murid rodents in the world.
Marek's disease virus (MDV) is highly contagious in chicken farms and is a cell-associated oncogenic herpesvirus. The gross morphology and histopathological characteristics of neoplasm are one of the important components of diagnosis. The spleen of infected birds 6-10 weeks old were obtained from a broiler chickens in poultry estate, Gadap, Karachi district, Sindh. On histopathological examination lymphoreticular infiltrations of neoplastic cells were seen under high magnification. A number of atrophied cells and extensive inflammatory reaction was present. Lymphoid cells of various sizes, lymphoblasts and immature cells were observed. Necrotic foci and haemorrhages were present. In some slides focal pleomorphic cell proliferation was obvious. Besides neoplastic lymphocytic aggregation and dysplastic foci were observed.
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