The first smallpox vaccine changed the world—but we're still not sure what was in it [feedly]

The first smallpox vaccine changed the world—but we're still not sure what was in it
https://www.popsci.com/what-was-in-original-smallpox-vaccine

Smallpox vaccination of children was discontinued in the 1970's as it was believed that the disease had been eradicated. That makes millions susceptible if its used in a biological terrorist attack. 

 -- via my feedly newsfeed