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世界衛生組織 WHO World Health Organization
世界衛生組織（簡稱世衛組織或世衛）是聯合國屬下的專門機構，國際最大的公共衛生組織，總部設於瑞士日內瓦。世界衛生組織的宗旨是使全世界人民獲得盡可能高水平的健康。該組織給健康下的定義為“身體、精神及社會生活中的完美狀態”。世界衛生組織的主要職能包括：促進流行病和地方病的防治；提供和改進公共衛生、疾病醫療和有關事項的教學與訓練；推動確定生物制品的國際標準。截至2005年5月，世界衛生組織組織共有193個成員國。   

The World Health Organization (WHO) is a specialized agency of the United Nations (UN) that is concerned with international public health. It was established on 7 April 1948, with headquarters in Geneva, Switzerland and 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 all 61 countries of the United Nations by 22 July 1946, with the first meeting of the World Health Assembly finishing on 24 July 1948. It incorporated the Office International d'Hygiène Publique and the League of Nations Health Organization. Since its creation, WHO has been responsible for playing a leading role in the eradication of smallpox. Its current priorities include communicable diseases, in particular, HIV/AIDS, malaria and tuberculosis; the mitigation of the effects of non-communicable diseases; sexual and reproductive health, development, and ageing; nutrition, food security and healthy eating; substance abuse; and drive the development of reporting, publications, and networking. WHO is responsible for the World Health Report, a leading international publication on health, the worldwide World Health Survey, and World Health Day.
Its links with the IAEA and distribution of contraception have both proved controversial, as have guidelines on healthy eating and the 2009 flu pandemic.