The Carter center says only 13 human cases of Guinea worm disease were reported worldwide last year. In 1986, Guinea worm infected 3.5 million people. There's a lot of discussion about how the last mile of an eradication program is the most difficult. People who drink unclean water can ingest parasites that can grow as long as three feet. The warm incubates for up to a year before painfully emerging, many times through the feet or other sensitive parts of the body. Adam Weiss, with the Carter center, tells the AP they are close to the end of Guinea worm, but not close enough. It is going to be a very long and arduous last mile. Part of the eradication work is training people to filter and drink clean water. Also, those who have had it are telling their stories. They're generally is kind of a fear of how bad it is to get Guinea worms. Weiss says Guinea worm is poised to be the second human disease to be eradicated after smallpox. I'm Ed Donahue