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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 November 14, 2017, a total of 88 chikungunya virus disease cases with illness onset in 2017 have been reported to ArboNET from 23 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 November 14, 2017)

Map of the United States showing states reporting travel-associated chikungunya virus disease cases, including, Alaska, California, Colorado, Florida, Georgia, Hawaii, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, 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 November 14, 2017)

Travel-associated cases
No. (%)
Locally-transmitted cases
No. (%)
State  (N=88) (N=0)
Alaska 1 (1) 0 (0)
California 20 (23) 0 (0)
Colorado 1 (1) 0 (0)
Florida 1 (1) 0 (0)
Georgia 2 (2) 0 (0)
Hawaii 2 (2) 0 (0)
Illinois 4 (5) 0 (0)
Iowa 1 (1) 0 (0)
Kansas 1 (1) 0 (0)
Louisiana 1 (1) 0 (0)
Maine 1 (1) 0 (0)
Maryland 1 (1) 0 (0)
Massachusetts 3 (3) 0 (0)
Michigan 3 (3) 0 (0)
Nebraska 2 (2) 0 (0)
New Jersey 6 (7) 0 (0)
New York 13 (15) 0 (0)
Ohio 3 (3) 0 (0)
Pennsylvania 1 (1) 0 (0)
Texas 11 (13) 0 (0)
Virginia 4 (5) 0 (0)
Washington 2 (2) 0 (0)
Wisconsin 4 (5) 0 (0)
Territories (N=0) (N=32)
Puerto Rico 0 (0) 32 (100)
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