Content abstract: The World Health Organization (WHO) is a specialized agency under the United Nations. Its predecessor can be traced back to the International Health Bureau established in Paris in 1907 and the World Health Organization established in Geneva in 1920. After the war, with the decision of the United Nations Economic and Social Council, representatives of 64 countries held the International Health Assembly in new york on July 1946, and signed the Constitution of the World Health Organization. 1948 On April 7th, the law came into effect after being approved by 26 UN member states, and the World Health Organization was proclaimed. April 7th every year has become a global "World Health Day". On June 24th of the same year, at the first World Health Assembly held in Geneva, the World Health Organization was formally established with its headquarters in Geneva, Switzerland.
Organizational purpose: The purpose of the World Health Organization is to enable people all over the world to achieve the highest possible health level. As of May 2009, WHO has 193 member countries. WHO is the guiding and coordinating body for health issues within the United Nations system. It is responsible for leading global health affairs, setting the health research agenda, formulating norms and standards, clarifying evidence-based policy plans, providing technical support to countries, and monitoring and evaluating health trends.