The TSETSE fly is a species of fly that is known to carry the sleeping sickness, also known as African trypanosomiasis. It is an insect-borne parasitic disease that is found in sub-Saharan Africa and is spread by the bite of the TSETSE fly. The fly is a large, dark-colored fly that is about the size of a housefly and is found in wooded and grassy areas. It is a major health concern in Africa and can cause severe neurological symptoms, including confusion, seizures, and coma. Treatment is available, but prevention is the best way to protect against the disease.