The World Health Organization or WHO is an agency of the United Nations responsible for improving public health. It was established in 1948 and is headquartered in Geneva, Switzerland. About 75% of its budget comes from donations, with the remainder coming from the UN's member nations.
The organization has primarily been responsible for the reduction or eradication of several contagious diseases, including smallpox. It currently focuses its efforts on HIV, tuberculosis, Ebola and malaria.