China, one of the founders of WHO, participated in the International Health Conference in 1946, which resutled in the drafting of the WHO constitution, turning over the functions of the Office International d'Hygiene Publique (OIHP) to WHO and setting up of an Interim Commision to prepare for the First World Health Assembly. It joined the WHO on 22 July 1946.
https://www.who.int/china/
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