David Shale/Oxford Scientific Films
The common South African tsetse fly transmits the parasitic protozoan known to produce the often fatal disease called sleeping sickness. The parasites are drawn into the body of the fly with the blood sucked from an infected person and, after a period of development, can be conveyed to the bloodstream of healthy victims. Rhodesian sleeping sickness, restricted to parts of Zimbabwe and Tanzania, is also transmitted by a species of tsetse fly, as is tsetse fly disease, or nagana, which affects many cattle, horses, and goats in southern and central Africa. Animals perennially subjected to the disease may become immune.
Scientific classification: Tsetse flies make up the family Muscidae in the order Diptera. The South African tsetse fly is classified as Glossina palpalis, and the tsetse fly that transmits Rhodesian sleeping sickness and nagana as Glossina morsitans.