2014 provisional data for the United States • In 2014, chikungunya was not a nationally notifiable disease in the United States. However, chikungunya cases could be reported to ArboNET, the national surveillance system for arthropod-borne diseases. The following are provisional data reported to ArboNET for 2014; these data will be updated when they are final. • As of February 10, 2015, a total of 2,492 chikungunya virus disease cases were reported to ArboNET from U.S. states for 2014. Eleven locally-transmitted cases were reported from Florida. All other cases occurred in travelers returning from affected areas. • A total of 4,513 chikungunya virus disease cases were reported to ArboNET from U.S. territories for 2014 (Table 2). Of these, 4,467 were locally-transmitted cases reported from Puerto Rico and the U.S. Virgin Islands. The remaining 46 cases occurred in travelers returning from other affected areas.

Stephen B. Thacker CDC Library collection