The sleeping sickness, which is transmitted by the tsetse fly, has been spreading for over a decade. It especially affects the Democratic Republic of Congo. Only 1 000 of cases per year have been identified, compared to 37 000 in 1990. If the bet is a success for the organization, it would be the third disease to disappear, after smallpox and poliomyelitis. About 3 countries are still concerned about the spreading of the sickness.