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2017 final 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.
  • A total of 156 chikungunya virus disease cases with illness onset in 2017 have been reported to ArboNET from 28 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 39 chikungunya virus disease cases with illness onset in 2017 have been reported to ArboNET from U.S. territories (Table). To date, 39 locally acquired cases have been reported from Puerto Rico.

States reporting chikungunya virus disease cases – United States, 2017

Map of the United States showing states reporting travel-associated chikungunya virus disease cases, including, Alabama, Alaska, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Nebraska, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Texas, Virginia, Washington, and Wisconsin

Table. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state or territory — United States, 2017

Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state or territory — United States, 2017
Travel-associated cases
No. (%)
Locally-transmitted cases
No. (%)
State  (N=156) (N=0)
Alabama 1 (1) 0 (0)
Alaska 2 (1) 0 (0)
California 32 (21) 0 (0)
Colorado 2 (1) 0 (0)
Connecticut 6 (4) 0 (0)
Delaware 1 (1) 0 (0)
Florida 5 (3) 0 (0)
Georgia 2 (1) 0 (0)
Hawaii 4 (3) 0 (0)
Illinois 4 (3) 0 (0)
Iowa 1 (1) 0 (0)
Kansas 1 (1) 0 (0)
Louisiana 3 (2) 0 (0)
Maine 1 (1) 0 (0)
Maryland 2 (1) 0 (0)
Massachusetts 11 (7) 0 (0)
Michigan 4 (3) 0 (0)
Minnesota 4 (3) 0 (0)
Nebraska 3 (2) 0 (0)
New Jersey 12 (8) 0 (0)
New York 19 (12) 0 (0)
North Carolina 3 (2) 0 (0)
Ohio 4 (3) 0 (0)
Pennsylvania 1 (1) 0 (0)
Texas 15 (10) 0 (0)
Virginia 5 (3) 0 (0)
Washington 3 (2) 0 (0)
Wisconsin 5 (3) 0 (0)
Territories (N=0) (N=39)
Puerto Rico 0 (0) 39 (100)
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