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sep 20, 1801 - Vaccine

Description:

The term "variolation" was used from the 19th century to avoid confusion with vaccination. An example of vaccination is using cowpox to be immune to smallpox; while variolation was using smallpox to become immune to smallpox.
(from https://simple.wikipedia.org/wiki/19th_century)

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A Timeline Of Mankind's Worst Enemy

ByAron Kifle
14 Dec 2018
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Date:

sep 20, 1801
Now
~ 224 years ago

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