Eradicate Smallpox
Smallpox was still killing millions
in 1967, two centuries after the invention of a vaccine for it. That year the
World Health Organization decided to immunize everyone in the world. To do so
it had to develop a vaccine that required no refrigeration and a new needle
that would simplify inoculation. Then came a seven-year program to contain
outbreaks through door-to-door surveillance. By 1979 smallpox had disappeared
from the planet.
http://hbr.org/web/slideshows/six-audacious-ideas-that-worked
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