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12h 11min, feb 23, 1767 y - Chicken Pox are out
Description:
People discover the catching of the chicken pox and have came out with symptoms and how long it should last for.
Added to timeline:
18 Jan 2018
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242
History Of Vaccinations
Date:
12h 11min, feb 23, 1767 y
Now
~ 257 years ago