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Histomonas meleagridis
''Histomonas meleagridis'' is species of parasitic protozoan that infects a wide range of birds including chickens, turkeys, peafowl, quail and pheasants, causing blackhead disease, infectious enterohepatitis, or histomoniasis. ''H. meleagridis'' can infect many birds, but it is most deadly in turkeys. It inhabits the lumen of cecum and parenchyma of liver, where it causes extensive necrosis. It is transmitted by another cecal parasite, the nematode ''Heterakis gallinarum''.
==Description==
''H. meleagridis'' is a microscopic, pleomorphic protozoan, and can exist in two forms, amoeboid and flagellated. Within the tissue, it is present as an amoeboid protozoan, while in the lumen or free in the contents of cecum, it lives as an elongated flagellated form. The amoeboid form is typically 8-15 μm in diameter, whereas the flagellated form can reach up to 30 μm in diameter.〔Griffiths HJ (1978). ''A Handbook of Veterinary Parasitology: Domestic Animals of North America''. University of Minnesota Press, Minneapolis, Minnesota, USA, pp. 23-25. ISBN 0-8166-0828-8〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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