33
/
AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
November 30, 2025
3557422
324270
2
Public Timelines
FAQ

jan 7, 1797 - Cowpox vaccination

Description:

Crude cowpox vaccination developed from infected cow fluid

Added to timeline:

26 Nov 2019
0
0
252

Date:

jan 7, 1797
Now
~ 228 years ago