The first known autochthonous transmission of chikungunya virus (CHIKV) fever in the Western Hemisphere occurred in October 2013 in the French sector of the island of Saint Martin, approximately 150 miles east from Puerto Rico [1]. Chikungunya virus is a mosquito-borne arbovirus widely distributed in Africa, Southeast Asia, and India, but until the last decade it was responsible mainly for sporadic, limited outbreaks of illness [2–5]. Its recent epidemic spread through the Caribbean now poses a threat to the continental countries of South, Central, and North America [6–10].