These worms get under your skin, literally. The hero fighting them? Jimmy Freaking Carter.

This is shaping up to be one of the biggest public health success stories of our time.

If you lived in northeastern Uganda 25 years ago and drank from public water sources, there was a pretty high chance that you'd contract a common but excruciating illness.

Guinea worm disease starts with a pain in your leg or foot, then a blister. Eventually, a parasite emerges from the wound. During this time, the pain is often so intense that you might not be able to work, take care of your family, or even walk.

It’s horrifying to even think about. But guinea worm has been a thing of the past for Ugandans since 2009.

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