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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.
What causes African sleeping sickness? There are 2 types of the disease. They are named for the areas of Africa where they are found. West African sleeping sickness is caused by the parasite Trypanosoma brucei gambiense. This long-term (chronic) infection can last for years. East African sleeping sickness is caused by Trypanosoma brucei rhodesiense. Itâs a short-term (acute) illness that may last several weeks to months. People from the U.S. who travel to Africa are rarely infected. On average, 1 U.S. citizen is infected every year. The person is typically infected in East African game parks. Who is at risk for African sleeping sickness?