Chikungunya virus in the United States

Prior to 2006, chikungunya virus disease was rarely identified in U.S. travelers.
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 in Asia, Africa, or the Indian Ocean.
In late 2013, the first local transmission of chikungunya virus in the Americas was identified in Caribbean countries and territories. Local transmission means that mosquitoes in the area have been infected with the virus and are spreading it to people.
Beginning in 2014, chikungunya virus disease cases were reported among U.S. travelers returning from affected areas in the Americas and local transmission was identified in Florida, Puerto Rico, and the U.S. Virgin Islands.
For 2014 final data, click here.
For 2015 final data, click here.
For 2016 provisional data, click here.
For 2017 provisional data, click here.