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Chikungunya virus in the United States

  • Chikungunya is not a nationally notifiable disease in the United States. However, chikungunya cases can be reported to ArboNET, the national surveillance system for arthropod-borne diseases.
  • From 2006‒2013, studies identified an average of 28 people per year in the United States with positive tests for recent chikungunya virus infection (Range 5‒65 per year). All were travelers visiting or returning to the United States from affected areas, mostly in Asia. Only a quarter of the cases were reported to ArboNET.
  • Beginning in 2014, cases were identified in travelers returning from the Caribbean. As of November 18, a total of 1,850 chikungunya virus disease cases have been reported to ArboNET from U.S. states (Table 1). Eleven locally-transmitted cases have been reported from Florida (Figure 1). All other cases occurred in travelers returning from affected areas in the Americas (N=1,819), Asia (N=11), or the Pacific Islands (N=9).
  • A total of 777 chikungunya virus disease cases have been reported to ArboNET from U.S. territories (Table 2). Seven hundred and thirty-nine locally-transmitted cases have been reported from Puerto Rico and the US Virgin Islands. The remaining 38 cases occurred in travelers returning from other affected areas in the Americas.
  • With the recent outbreaks in the Americas and the Pacific, the number of chikungunya cases among travelers visiting or returning to the United States from affected areas will continue to increase. These imported cases could result in local spread of the virus in the continental United States.

Chikungunya virus disease cases reported by state – United States, 2014 (as of November 18, 2014)

Map of the United States showing locally acquired cases of Chikungunya in Florida and travel-associated cases reported in Arizona, Arkansas, California, Connecticut, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Nebraska, Nevada, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, Tennessee, Texas, US Virgin Islands, Virginia, West Virginia, and Wisconsin
Table 1. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state— United States, 2014 (as of November 18)*
State Travel-associated cases
(N=1,839)
Locally-transmitted cases
(N=11)
No. (%) No. (%)
Alabama 13 (1) 0 (0)
Arizona 12 (1) 0 (0)
Arkansas 6 (<1) 0 (0)
California 46 (3) 0 (0)
Colorado 11 (1) 0 (0)
Connecticut 29 (2) 0 (0)
Delaware 5 (<1) 0 (0)
District of Columbia 10 (1) 0 (0)
Florida 336 (18) 11 (100)
Georgia 26 (1) 0 (0)
Hawaii 6 (<1) 0 (0)
Idaho 1 (<1) 0 (0)
Illinois 13 (1) 0 (0)
Indiana 23 (1) 0 (0)
Iowa 3 (<1) 0 (0)
Kansas 9 (<1) 0 (0)
Kentucky 22 (1) 0 (0)
Louisiana 12 (1) 0 (0)
Maine 5 (<1) 0 (0)
Maryland 44 (2) 0 (0)
Massachusetts 104 (6) 0 (0)
Michigan 16 (1) 0 (0)
Minnesota
23 (1) 0 (0)
Mississippi 8 (<1) 0 (0)
Missouri 14 (1) 0 (0)
Nebraska
6 (<1) 0 (0)
Nevada 1 (<1) 0 (0)
New Hampshire 13 (1) 0 (0)
New Jersey 143 (8) 0 (0)
New Mexico 2 (<1) 0 (0)
New York 525 (29) 0 (0)
North Carolina 34 (2) 0 (0)
Ohio 34 (2) 0 (0)
Oklahoma 7 (<1) 0 (0)
Oregon 5 (<1) 0 (0)
Pennsylvania 73 (4) 0 (0)
Rhode Island 34 (2) 0 (0)
South Carolina 17 (1) 0 (0)
South Dakota 2 (<1) 0 (0)
Tennessee 30 (2) 0 (0)
Texas 52 (3) 0 (0)
Utah 2 (<1) 0 (0)
Vermont 2 (<1) 0 (0)
Virginia 39 (2) 0 (0)
Washington 9 (<1) 0 (0)
West Virginia 2 (<1) 0 (0)
Wisconsin 10 (1) 0 (0)

*Chikungunya is not a nationally notifiable diseas

 

Table 2. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by territory — United States, 2014 (as of November 18)*
Territory Travel-associated cases
(N=38)
Locally-transmitted cases
(N=739)
No. (%) No. (%)
Puerto Rico† 32 (84) 653 (88)
US Virgin Islands‡ 6 (16) 86 (12)

*Chikungunya is not a nationally notifiable disease.
†Additional information available from the Puerto Rico Department of Health.
‡Additional information available from the U.S. Virgin Islands Department of Health.

 

 
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