Dr. Edward Jenner,
England
1796
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Suggested by Stephanie K.,
Nova Scotia.
Okay, so they're kind of a
mixed blessing, especially when it's time for your "booster"
shots. But
when England's Dr. Edward Jenner first came up with the idea
of injecting a healthy person with a mild disease called
"cowpox" to protect them against a much deadlier disease
called "smallpox," he created a way to protect future
generations from many infectious diseases, from measles to
polio and more. And thanks to a world-wide campaign of
vaccinations, smallpox has been virtually eradicated
(destroyed) around the world.
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