2020 Case Counts in the US

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Provisional Data as of May 25, 2021

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. This webpage contains provisional data reported to ArboNET for 2020.

US States

  • 29 chikungunya virus disease cases reported
    • 28 cases in travelers returning from an affected area
    • 0 cases acquired through presumed local mosquito-borne transmission
    • 1 case acquired through laboratory transmission

US territories

  • 0 chikungunya virus disease cases reported
    • 0 cases in travelers returning from an affected area
    • 0 cases acquired through presumed local mosquito-borne transmission

Chikungunya virus disease cases* reported to ArboNET by states and territories – United States, 2020 (as of May 25, 2021)

Map of the United States showing states reporting travel-associated chikungunya virus disease cases.

Chikungunya virus disease cases* reported to ArboNET — United States, 2020 (as of May 25, 2021)

Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state or territory — United States
Travel-associated cases
No. (%)
Locally acquired cases
No. (%)
State  (N=29) (N=0)
California 4 (14) 0 (0)
Colorado 1 (3) 0 (0)
Idaho 1 (3) 0 (0)
Illinois 2 (7) 0 (0)
Iowa 2 (7) 0 (0)
Missouri 1 (3) 0 (0)
New Jersey 3 (10) 0 (0)
New York 4† (14) 0 (0)
North Carolina 6 (21) 0 (0)
South Carolina 1 (3) 0 (0)
Tennessee 1 (3) 0 (0)
Texas 3 (10) 0 (0)
Territories (N=0) (N=0)

*Includes confirmed and probable disease cases

†Includes case acquired through laboratory exposure