Smallpox

This seems strange to me, but I read it in a journal article...so I guess it's not a lie?

Apparently smallpox, the first human infectious disease (or any other disease, I think...) to be made preventable by innoculation, is also the only human infectious disease to have been entirely eradicated. 

Which arguably makes one Mr Edward Anthony Jenner of Gloucestershire the most humanitarian man in the history of, well, humanity.  Let's hear it for Eddie and his cowpox/smallpox jab, saving countless millions since 1796!