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12 Diseases That Just Won't Quit

The plague isn't the only resurgent disease humans once thought they had beat.

July 22, 2014
4:00 PM EDT
In Madagascar, about 500 people every year contract the plague. | iStock
A ribbons molecular model of Botulinum Toxin, commonly known as Botox. This protein produced by the botulism bacteria is highly neurotoxic. Yet it's commonly used in cosmetic surgery. | iStock
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Warner Bros. Pictures