Smallpox was one of the worst diseases in history. It is also the only human disease we have ever *completely eradicated.* It led to fierce debates, some of the first clinical trials, and the first vaccines. The story of smallpox—and how we killed it:https://rootsofprogress.org/smallpox-and-vaccines …
0 replies
18 retweets
38 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.