African trypanosomiasis risk factors

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Risk Factors

East African Trypanosomiasis

East African trypanosomiasis is usually found in woodland and savannah areas away from human habitation. Tourists, hunters, game wardens, and other persons working or visiting game parks in East and Central Africa are at greatest risk for illness.

West African Trypanosomiasis

Tsetse flies can be found in Western and Central African forests, in areas of thick shrubbery and trees by rivers and waterholes. Risk of infection increases with the number of times a person is bitten by the tsetse fly. Therefore, tourists are not at great risk for contracting West African trypanosomiasis unless they are traveling and spending long periods of time in rural areas of Western and Central Africa.

In addition to the bite of the tsetse fly, the disease is contractible in the following ways:

• Mother to child infection: the trypanosome can cross the placenta and infect the fetus, causing perinatal death.
• Laboratories: accidental infections, for example, through the handling of blood of an infected person and organ transplantation, although this is uncommon.
• Blood transfusion

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