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1 ene 1796 año - 1796 England

Descripción:

Edward Jenner noticed that the milkmaids only showed symptoms of cow pox by spots on there hands. He also noticed, if they got small pox they wouldn't receive small pox. Jenner discovered that cow pox can be given as a weakened form of small pox.

Añadido al timeline:

Vaccine

ByJailyn Moody
24 ene 2018

fecha:

1 ene 1796 año
Ahora mismo
~ 228 years ago

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