- In 2014 an outbreak of Chikungunya has spread across the Americas
- The mosquito-borne virus causes debilitating symptoms such as joint pain
- More than 1 million people have been infected and 155 have died
- There is no treatment or vaccine, making prevention the main strategy for control
(CNN)Its name means "bending over in pain." It has no treatment or vaccine. Its symptoms resemble Dengue fever. And it has infected more than 1 million people -- 155 of them fatally -- since spreading to the Americas one year ago.