2019 provisional 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.
As of April 30, 2020, a total of 171 chikungunya virus disease cases with illness onset in 2019 have been reported to ArboNET from 30 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 two chikungunya virus disease cases with illness onset in 2019 have been reported to ArboNET from U.S. territories (Table). To date, two locally acquired cases have been reported from Puerto Rico.

States reporting chikungunya virus disease cases – United States, 2019 (as of April 30, 2020)

Laboratory-confirmed chikungunya virus disease cases reported to ArboNET by state or territory — United States
	Travel-associated cases No. (%)	Locally-transmitted cases No. (%)
State	(N=171)	(N=0)
Arizona	4 (2)	0 (0)
California	35 (20)	0 (0)
Colorado	2 (1)	0 (0)
Florida	6 (4)	0 (0)
Georgia	1 (1)	0 (0)
Hawaii	2 (1)	0 (0)
Illinois	9 (5)	0 (0)
Iowa	2 (1)	0 (0)
Maryland	1 (1)	0 (0)
Massachusetts	6 (4)	0 (0)
Missouri	1 (1)	0 (0)
Michigan	1 (1)	0 (0)
Montana	1 (1)	0 (0)
Nebraska	1 (1)	0 (0)
New Jersey	14 (8)	0 (0)
New Mexico	2 (1)	0 (0)
New York	15 (9)	0 (0)
North Carolina	8 (5)	0 (0)
Ohio	14 (8)	0 (0)
Pennsylvania	1 (1)	0 (0)
Rhode Island	1 (1)	0 (0)
South Carolina	2 (1)	0 (0)
Tennessee	3 (2)	0 (0)
Texas	19 (11)	0 (0)
Utah	1 (1)	0 (0)
Vermont	1 (1)	0 (0)
Virginia	10 (6)	0 (0)
Washington	4 (2)	0 (0)
Wisconsin	3 (2)	0 (0)
Wyoming	1 (1)	0 (0)

Territories	(N=0)	(N=2)
Puerto Rico	0 (0)	2 (100)

Page last reviewed: May 1, 2020