1.   Earlier in his career, Henderson led the World Health Organization effort that eliminated smallpox as a naturally occurring threat.

2.   It was vaccines made from the cowpox virus that eliminated smallpox from the globe.

3.   Jenner dreamed of eliminating smallpox.

4.   Smallpox has been eliminated.

5.   Vaccinia-based vaccines played a major role in eliminating smallpox throughout the world.