The League's health organisation had three bodies: the Health Bureau, containing permanent officials of the League; the General Advisory Council or Conference, an executive section consisting of medical experts; and the Health Committee. The committee's purpose was to conduct inquiries, oversee the operation of the League's health work, and prepare work to be presented to the council. This body focused on ending leprosy, malaria, and yellow fever, the latter two by starting an international campaign to exterminate mosquitoes. The Health Organisation also worked successfully with the government of the Soviet Union to prevent typhus epidemics, including organising a large education campaign.