•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 May 5, 2015, a total of 126 chikungunya virus disease cases have been reported to ArboNET from 26 U.S. states for 2015 (Table 1 & Map). All reported cases occurred in travelers returning from affected areas. No locally-transmitted cases have been reported from U.S. states.

•A total of 78 chikungunya virus disease cases have been reported to ArboNET from U.S. territories (Table 2). All reported cases were locally-transmitted cases reported from Puerto Rico and the US Virgin Islands.

Stephen B. Thacker CDC Library collection

United States