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Chikungunya virus in the United States

Updates of chikungunya case counts are publicly released every Wednesday by 12 p.m. MT.

  • 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 October 28, a total of 1,556 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=1,529), the Pacific Islands (N=8), or Asia (N=8).
  • A total of 653 chikungunya virus disease cases have been reported to ArboNET from U.S. territories (Table 2). Six hundred and sixteen locally-transmitted cases have been reported from Puerto Rico and the US Virgin Islands. The remaining 37 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 October 28, 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 October 28)*
State Travel-associated cases
(N=1,545)
Locally-transmitted cases
(N=11)
No. (%) No. (%)
Alabama 13 (1) 0 (0)
Arizona 10 (1) 0 (0)
Arkansas 5 (<1) 0 (0)
California 34 (2) 0 (0)
Colorado 9 (1) 0 (0)
Connecticut 25 (2) 0 (0)
Delaware 4 (<1) 0 (0)
District of Columbia 10 (1) 0 (0)
Florida 284 (18) 11 (100)
Georgia 23 (1) 0 (0)
Hawaii 5 (<1) 0 (0)
Idaho 1 (<1) 0 (0)
Illinois 13 (1) 0 (0)
Indiana 23 (1) 0 (0)
Iowa 2 (<1) 0 (0)
Kansas 7 (<1) 0 (0)
Kentucky 20 (1) 0 (0)
Louisiana 12 (1) 0 (0)
Maine 5 (<1) 0 (0)
Maryland 42 (3) 0 (0)
Massachusetts 73 (5) 0 (0)
Michigan 15 (1) 0 (0)
Minnesota
22 (1) 0 (0)
Mississippi 8 (1) 0 (0)
Missouri 11 (1) 0 (0)
Nebraska
6 (<1) 0 (0)
Nevada 1 (<1) 0 (0)
New Hampshire 13 (1) 0 (0)
New Jersey 130 (8) 0 (0)
New Mexico 1 (<1) 0 (0)
New York 435 (28) 0 (0)
North Carolina 30 (2) 0 (0)
Ohio 31 (2) 0 (0)
Oklahoma 7 (<1) 0 (0)
Oregon 4 (<1) 0 (0)
Pennsylvania 35 (2) 0 (0)
Rhode Island 34 (2) 0 (0)
South Carolina 14 (1) 0 (0)
South Dakota 2 (<1) 0 (0)
Tennessee 30 (2) 0 (0)
Texas 40 (3) 0 (0)
Utah 2 (<1) 0 (0)
Vermont 2 (<1) 0 (0)
Virginia 32 (2) 0 (0)
Washington 9 (1) 0 (0)
West Virginia 2 (<1) 0 (0)
Wisconsin 9 (1) 0 (0)

*Chikungunya is not a nationally notifiable disease.

 

Table 2. Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by territory — United States, 2014 (as of October 28)*
Territory Travel-associated cases
(N=37)
Locally-transmitted cases
(N=616)
No. (%) No. (%)
Puerto Rico† 31 (84) 553 (90)
US Virgin Islands‡ 6 (16) 63 (10)

*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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