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26 jun 1820 año - Smallpox Vaccine Widespread
Descripción:
By 1820, vaccination against smallpox had spread to much of the world.
Añadido al timeline:
History of Pathogens
By
Mariah Kunz
14 dic 2018
1
0
416
fecha:
26 jun 1820 año
Ahora mismo
~ 204 years ago
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