2018 provisional data for the United States

• Chikungunya virus disease became a nationally notifiable condition in 2015. Cases are reported to CDC by state and local health departments using standard case definitions.

• As of August 21, 2018, a total of 36 chikungunya virus disease cases with illness onset in 2018 have been reported to ArboNET from 17 U.S. states (Table & 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 zero chikungunya virus disease cases with illness onset in 2018 have been reported to ArboNET from U.S. territories (Table).

Stephen B. Thacker CDC Library collection

United States