Guinea worm is almost eradicated
Guinea worm is a nonfatal but debilitating parasitic infection, and as recently as 1986, millions of people got it every year. There is no vaccine or cure. Guinea worms grow in your body cavity, then work their way out of your body, often through your leg or foot. Once the worm's exposed, it needs to be gradually coaxed out of your body in a sterile environment. If, to relieve the pain, you place your foot in water with a worm exposed, the worm will burst and send millions of larvae into the water supply. If people drink the water later, then they're at risk of getting the worm too. But despite the lack of a modern medical treatment for the condition, it's almost gone, due to a coordinated international eradication campaign spearheaded by Jimmy Carter and the Carter Center.