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
Añadido al timeline:
fecha:
1 ene 1722 año
Ahora mismo
~ 304 years ago