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African trypanosomiasis or sleeping sickness is a parasitic disease of humans and other animals. It is caused by protozoa of the species Trypanosoma brucei. There are two types that infect humans, Trypanosoma brucei gambiense (T.b.g) and Trypanosoma brucei rhodesiense (T.b.r.). T.b.g causes over 98% of reported cases. Both are usually transmitted by the bite of an infected tsetse fly and are most common in rural areas.
There are two types of African trypanosomiasis (also called sleeping sickness); each named for the region of Africa in which it was found historically. Individuals can become infected with West African trypanosomiasis if they receive a bite from an infected tsetse fly, which is only found in Africa.est African trypanosomiasis, also called Gambian sleeping sickness, is caused by a parasite called Trypanosoma brucei gambiense carried by the tsetse fly. In recent years, 7,000-10,000 new cases of West African trypanosomiasis have been reported to the World Health Organization annually.