
Sleeping sickness (or African trypanosomiasis) results from a parasite. It passes through bites of infected tsetse flies. The main people at risk of developing it are those who travel to Africa. Tsetse flies reside there and only live in rural areas. They are in woodland thickets of the savanna and dense vegetation along streams. However, the disease is prevalent in tropical Africa. Some high-risk areas are Angola, Central African Republic, Congo, and Tanzania.