1 janv. 1796 - 1796 England
Description:
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.Ajouté au bande de temps:
Date:
1 janv. 1796
Maintenaint
~ Il y a 228 ans
