1 janv. 1500 - Variolation and smallpox
Description:
-In the 1600s China first started using variolation which was a process of grinding up smallpox scabs and having healthy people inhale them to create a more mild infection-Dropped mortality rates to 1%
Ajouté au bande de temps:
Date:
1 janv. 1500
Maintenaint
~ Il y a 524 ans
