2016 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.
In 2016, a total of 248 chikungunya virus disease cases with illness onset in 2016 have been reported to ArboNET from 38 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.
In 2016, a total of 180 chikungunya virus disease cases with illness onset in 2016 have been reported to ArboNET from U.S. territories (Table). Of these, 179 were locally acquired cases reported from Puerto Rico and the US Virgin Islands. The remaining case occurred in a traveler returning from other affected areas.

States reporting chikungunya virus disease cases – United States, 2016

	Travel-associated cases No. (%)	Locally-transmitted cases No. (%)
State	(N=248)	(N=0)
Alabama	1 (<1)	0 (0)
Arizona	2 (1)	0 (0)
Arkansas	1 (<1)	0 (0)
California	57 (23)	0 (0)
Connecticut	2 (1)	0 (0)
Delaware	1 (<1)	0 (0)
Florida	8 (3)	0 (0)
Georgia	1 (<1)	0 (0)
Hawaii	4 (1)	0 (0)
Illinois	13 (5)	0 (0)
Indiana	2 (1)	0 (0)
Iowa	2 (1)	0 (0)
Kansas	1 (<1)	0 (0)
Kentucky	3 (1)	0 (0)
Louisiana	1 (<1)	0 (0)
Maryland	4 (2)	0 (0)
Massachusetts	6 (2)	0 (0)
Michigan	4 (2)	0 (0)
Minnesota	16 (7)	0 (0)
Missouri†	1 (<1)	0 (0)
Montana	1 (<1)	0 (0)
Nebraska	1 (<1)	0 (0)
New Hampshire	1 (<1)	0 (0)
New Jersey	11 (4)	0 (0)
New Mexico	3 (1)	0 (0)
New York	38 (15)	0 (0)
North Carolina	3 (1)	0 (0)
North Dakota	1 (<1)	0 (0)
Ohio	4 (2)	0 (0)
Pennsylvania	5 (2)	0 (0)
Rhode Island	3 (1)	0 (0)
South Carolina	4 (2)	0 (0)
Tennessee	4 (2)	0 (0)
Texas	20 (8)	0 (0)
Utah	1 (<1)	0 (0)
Virginia	6 (2)	0 (0)
Washington	10 (4)	0 (0)
Wisconsin	2 (1)	0 (0)

Territories	(N=1)	(N=179)
Puerto Rico	1 (100)	178 (99)
U.S. Virgin Islands	0 (0)	1 (1)