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26 giug 1820 anni - Smallpox Vaccine Widespread

Descrizione:

By 1820, vaccination against smallpox had spread to much of the world.

Aggiunto al nastro di tempo:

History of Pathogens

14 dic 2018

1

0

529

Data:

26 giug 1820 anni

Adesso

~ 205 years ago

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