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Trypanosome Members of the genus Trypanosoma live as parasites in the blood of fish, birds and mammals, and many Trypanosomes need a second host species for part of their life cycle. In parts of Africa, Trypanosoma gambiense and Trypanosoma rhodesiense cause sleeping sickness in people, and the tsetse fly acts as the alternate host. A person can catch the disease when bitten by an infected fly. Leeches act as secondary hosts for some species of Trypanosoma. Chaga's disease in humans and nagana in cattle are two more diseases caused by Trypanosomes. [CH] {EN}
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