AdvertisementPainful Virus Sweeps Central America, Gains A Toehold In U.S.Play03:22Download AudioJanuary 01, 2015Michaeleen DouclefffacebookEmailA doctor examines a patient during a June campaign to find chikungunya cases in the town of Ayutuxtepeque, El Salvador. The country reported more than 100,000 cases of chikungunya in 2014. (AFP/Getty Images)
