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1 ene 1722 año - 242 People variolated in Boston

Descripción:

Mather and Boyleston advocate for variation and help variolate people in Boston. Those that were variolated had a mortality rate of 2.5% compared to 15-20% for the general population

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fecha:

1 ene 1722 año
Ahora mismo
~ 304 years ago