The British doctor Edward Jenner used the cowpox virus to protect against smallpox in 1796, but it wasn’t until Louis Pasteur developed a rabies vaccine in 1885 that medicine—and government—began to accept the idea that making someone sick could prevent further sickness.
Colben Mae L. Solomon
http://www.theatlantic.com/magazine/archive/2013/11/innovations-list/309536/#sthash.H3HjsaJ4.dpuf
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