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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 September 23, a total of 1,125 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=1,100), the Pacific Islands (N=8), or Asia (N=6).
  • A total of 492 chikungunya virus disease cases have been reported to ArboNET from U.S. territories (Table 2). Four hundred and sixty-three locally-transmitted cases have been reported from Puerto Rico and the US Virgin Islands. The remaining 29 cases occurred in travelers returning from other affected areas in the Americas.
  • With the recent outbreaks in the Caribbean 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 September 23, 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 September 23)*
State Travel-associated cases
(N=1114)
Locally-transmitted cases
(N=11)
No. (%) No. (%)
Alabama 10 (1) 0 (0)
Arizona 7 (1) 0 (0)
Arkansas 3 (<1) 0 (0)
California 27 (2) 0 (0)
Colorado 6 (1) 0 (0)
Connecticut 24 (2) 0 (0)
Delaware 2 (<1) 0 (0)
District of Columbia 8 (1) 0 (0)
Florida 217 (19) 11 (100)
Georgia 17 (2) 0 (0)
Hawaii 3 (<1) 0 (0)
Idaho 1 (<1) 0 (0)
Illinois 7 (1) 0 (0)
Indiana 19 (2) 0 (0)
Iowa 1 (<1) 0 (0)
Kansas 5 (<1) 0 (0)
Kentucky 19 (2) 0 (0)
Louisiana 10 (1) 0 (0)
Maine 3 (<1) 0 (0)
Maryland 31 (3) 0 (0)
Massachusetts 43 (4) 0 (0)
Michigan 12 (1) 0 (0)
Minnesota
20 (2) 0 (0)
Mississippi 6 (1) 0 (0)
Missouri 9 (1) 0 (0)
Nebraska
5 (<1) 0 (0)
Nevada 1 (<1) 0 (0)
New Hampshire 13 (1) 0 (0)
New Jersey 91 (8) 0 (0)
New Mexico 1 (<1) 0 (0)
New York 259 (23) 0 (0)
North Carolina 27 (2) 0 (0)
Ohio 26 (2) 0 (0)
Oklahoma 7 (1) 0 (0)
Oregon 4 (<1) 0 (0)
Pennsylvania 29 (3) 0 (0)
Rhode Island 28 (3) 0 (0)
South Carolina 13 (1) 0 (0)
South Dakota 1 (<1) 0 (0)
Tennessee 30 (3) 0 (0)
Texas 30 (3) 0 (0)
Utah 1 (<1) 0 (0)
Virginia 25 (2) 0 (0)
Washington 4 (<1) 0 (0)
West Virginia 1 (<1) 0 (0)
Wisconsin 8 (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 September 23)*
Territory Travel-associated cases
(N=29)
Locally-transmitted cases
(N=463)
No. (%) No. (%)
Puerto Rico† 24 (83) 418 (90)
US Virgin Islands‡ 5 (17) 45 (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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