- Leprosy and TB are all still prevalent around the world
- Plague still affects up to 3,000 people a year
- To date, smallpox is the only disease to have ever been eradicated
(CNN)This year, the United States has recorded 16 cases of plague, while recent figures have revealed that in the UK, cases of "19th-century" diseases such as scurvy and scarlet fever are on the rise.
Go to CNN.com/unseenenemy for more stories and resources about epidemics, pandemics and the CNN Films documentary, "Unseen Enemy."