The TSETSE fly is a species of biting fly that is responsible for the spread of sleeping sickness, also known as African trypanosomiasis. It is an infectious disease caused by a parasite that is transmitted through the bite of the TSETSE fly. The fly is found in tropical and subtropical regions of Africa, where it is a major health concern. The disease can be fatal if left untreated, so controlling the spread of the TSETSE fly is essential to preventing the spread of sleeping sickness.