Smallpox is the first and only human disease that was declared eradicated on a global scale. Also, with the breakthroughs made while eradicating smallpox and a number of other creative solutions, we are now really close to making a few more diseases a thing of the past.
THIS IS COOL. I WANT TO LEARN SOMETHING ELSE, TOO!
Video via – SciShow
Further Readings And References @ ScienceDirect, Smallpox (Wikipedia), NEJM, and The History of Vaccines
ScienceSwitch 
Reblogged this on Serendipity – Seeking Intelligent Life on Earth and commented:
For the anti-vaccinators out there … this one is for you!
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