20 sept. 1801 - Vaccine
Description:
The term "variolation" was used from the 19th century to avoid confusion with vaccination. An example of vaccination is using cowpox to be immune to smallpox; while variolation was using smallpox to become immune to smallpox.(from https://simple.wikipedia.org/wiki/19th_century)
Ajouté au bande de temps:
Date:
20 sept. 1801
Maintenaint
~ Il y a 224 ans