Established in 1948 to promote 'the highest possible level of health' in all peoples, the World Health Organization provides a clearinghouse for information on the latest developments in disease and healthcare. Based in Geneva, Switzerland, this public health agency of the United Nations establishes international sanitary standards and quarantine measures, sponsors measures for the control of epidemic and endemic disease, including immunization campaigns and assistance in providing sources of pure water, and encourages the strengthening of public health programs in member nations. With 193 members, the WHO encompasses nearly all the U.N. member nations.