Guinea worm is going down. Way down.
From more than 3 million cases of Guinea worm disease a year in the 1980s, the world tally in 2016 stands at just two confirmed cases.
Both are in Chad and are believed to have been contained before they had a chance to spread. (There are also two suspected cases, one in Chad and one in Ethiopia.)
If Guinea worm is pushed into extinction, then Guinea worm disease would be just the second human disease to be eradicated after smallpox.