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 July 14, 2015, a total of 224 chikungunya virus disease cases have been reported to ArboNET from 34 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 94 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. •Table 1. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state— United States, 2015 (as of July 14, 2015) •Table 2. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by territory — United States, 2015 (as of July 14, 2015)

Stephen B. Thacker CDC Library collection