Campaign to eradicate guinea worm in hard-hit Nigeria may have worked

by Donald G. McNeil Jr.

Nigeria, once the worst-afflicted country in the world with an estimated 653,000 cases in 1989, appears to be free of guinea worm disease, which is a painful parasitic infection transmitted to humans through a  water supply contaminated with guinea worm larvae. Photo: Vanessa Vick/New York Times

After 20 years, the Carter Center is ready to declare a major victory in its war on guinea worm: Nigeria, once the worst-afflicted country in the world, appears to be free of the worms.