2015 provisional data for the United States • In 2015, chikungunya virus disease became a nationally notifiable condition. Cases are reported to CDC by state and local health departments using standard case definitions. • As of March 24, 2015, a total of 68 chikungunya virus disease cases have been reported to ArboNET from 19 U.S. states for 2015. All reported cases occurred in travelers returning from affected areas. No locally-transmitted cases have been reported from U.S. states. • A total of 52 chikungunya virus disease cases have been reported to ArboNET from U.S. territories. All reported cases were locally-transmitted cases reported from Puerto Rico and the US Virgin Islands.

Stephen B. Thacker CDC Library collection