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I know the date April 7tg,but the 1st day is I don't know if I just googled it the day is April 7th 1950.
In 1948, the WHO organised the first World Health Assembly which called for the creation of a "World Health Day". In 1950, the first World Health Day was celebrated on April 7 and since then, it is observed every year on the same day
The first World Health Day was celebrated on April 7 and since then, it is observed every year on the same day.