Polio and Guinea worm disease: Four decades after smallpox, are these the next human diseases to be eradicated?

The last naturally occurring case of indigenous smallpox was diagnosed in Somalia on 26 October 1977. The once devastating viral disease is estimated to have killed some 300 million people in the 20th century alone. Thanks to the yeoman's work of many in getting people around the globe vaccinated, this scourge is now part of the history ["]