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Medical Definition of Leukocytozoon
1. A genus of sporozoan parasites (family Plasmodiidae, suborder Haemosporina) that attack the immature red blood cells of birds and are capable of causing acute outbreaks of disease, particularly in turkeys and ducks; vectors are black flies, Simulium species, and the bloodsucking gnat Culicoides. Synonym: Leukocytozoon. Origin: G. Leukos, white, + kytos, cell, + zoon, animal (05 Mar 2000)