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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.
The West African form of sleeping sickness usually causes death in two or three years; in some cases, the patient develops a tolerance to the infection and may continue to live for many years as a carrier of the parasites. Diagnosis and treatment. The earlier that sleeping sickness is diagnosed and treated, the greater the chances for recovery. Diagnosis is made by microscopic examination of blood and lymph for the presence of trypanosomes and of cerebrospinal fluid for increased levels of white blood cells.