 World Health Organization, the World Health Organization who is a specialized agency of the United Nations but is concerned with international public health. It was established on April 7, 1948, and is headquartered in Geneva, Switzerland. The WHO is a member of the United Nations Development Group. Its predecessor, the Health Organization, was an agency of the League of Nations. The Constitution of the World Health Organization had been signed by 63 countries on April 7, 1948, with the first meeting of the World Health Assembly finishing on July 24, 1948. It incorporated the Office International Thive Gene Public and the League of Nations Health Organization. Since its establishment, it has played the leading role in the eradication of smallpox. Its current priorities include communicable diseases, in particular HIV-slash AIDS, Ebola, malaria and tuberculosis, the mitigation of the effects of non-communicable diseases such as sexual and reproductive health, development, and aging, nutrition, food security and healthy eating, occupational health, substance abuse, and driving the development of reporting, publications, and networking. The WHO is responsible for the World Health Report, the Worldwide World Health Survey, and World Health Day. The current director-general of the WHO is Ted Rose Adonan, who started his five-year term on July 1, 2017.