The World Health Organisation or WHO is a UN specialised agency concerned with public health worldwide. Established on April 7th, 1948, it has its headquarters in Geneva, Switzerland. It is a member of the UN Development Group. Its predecessor organisation was the Health Organisation, an agency of the now defunct League of Nations. The WHO’s origins lie in the series of conferences that took place under the aegis of International Sanitary Conferences from 1851 to 1938.
The WHO was the first specialised UN agency to which every UN member subscribed. It played a major role in smallpox eradication. Its activities include tackling communicable diseases, limiting the effects of non-communicable diseases, reproductive and sexual health, ageing, nutrition, occupational health, substance abuse and many other health-related domains. It publishes the World Health Report every two years. Currently, WHO is headed by Director-General Tedros Adhanom.