Support WBURChikun-What? A New Mosquito-Borne Virus Lands In The U.S.Play04:00Download AudioMichaeleen DoucleffJuly 03, 2014 ShareSick with chikungunya, Karla Sepulveda, 5, waits in a public hospital with her grandmother in Boca Chica, Dominican Republic, on May 15. The Caribbean nation has reported more than 100,000 cases this year. (AP)
