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2017 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 September 19, 2017, a total of 46 chikungunya virus disease cases with illness onset in 2017 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 32 chikungunya virus disease cases with illness onset in 2017 have been reported to ArboNET from U.S. territories (Table). To date, 32 locally acquired cases have been reported from Puerto Rico.

States reporting chikungunya virus disease cases – United States, 2017 (as of September 19, 2017)

Map of the United States showing states reporting travel-associated chikungunya virus disease cases, including, Alaska, California, Colorado, Georgia, Illinois, Kansas, Massachusetts, Michigan, Nebraska, New Jersey, New York, Ohio, Pennsylvania, Texas, Virginia, Washington, and Wisconsin

Table. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state or territory — United States, 2017 (as of September 19, 2017)

Travel-associated cases
No. (%)
Locally-transmitted cases
No. (%)
State  (N=46) (N=0)
Alaska 1 (2) 0 (0)
California 9 (20) 0 (0)
Colorado 1 (2) 0 (0)
Georgia 2 (4) 0 (0)
Illinois 1 (2) 0 (0)
Kansas 1 (2) 0 (0)
Massachusetts 3 (7) 0 (0)
Michigan 2 (4) 0 (0)
Nebraska 2 (4) 0 (0)
New Jersey 2 (4) 0 (0)
New York 7 (15) 0 (0)
Ohio 3 (7) 0 (0)
Pennsylvania 1 (2) 0 (0)
Texas 7 (15) 0 (0)
Virginia 1 (2) 0 (0)
Washington 1 (2) 0 (0)
Wisconsin 2 (4) 0 (0)
Territories (N=0) (N=32)
Puerto Rico 0 (0) 32 (100)
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