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13 oct 1879 año - Variolation

Descripción:

Purposely infect an individual with smallpox to create immunity. 1-3% chance of working

Añadido al timeline:

The History of Infectious Diseases

14 dic 2018

1

0

1006

fecha:

13 oct 1879 año

Ahora mismo

~ 146 years ago

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