The disease is picked up by drinking water that contains larvae of the parasitical worm. After completing its life cycle in the human body, the long, thread-like worm, about the diameter of a kite string, erupts from the skin of the host and can take days or weeks to work itself out.
The Carter Center has worked with governments, health agencies and nonprofits across the world, with President Carter often opening doors that had been closed, to kill off the disease.
He is headed to Washington for the nomination of President-elect Donald Trump. He said he hopes to talk to people in the new administration about continuing U.S. support for disease-elimination programs.