- Before 2006, chikungunya virus disease was rarely identified in U.S. travelers.
- During 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, Texas, Puerto Rico, and the U.S. Virgin Islands.
- 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.
- County-level data from 2014 – present (provisional data) are located here.
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US Territories Travel-associated |
|---|---|---|---|---|
| 2014 | 12 | 2,799 | 4,659 | 51 |
| 2015 | 1 | 895 | 237 | 0 |
| 2016 | 0 | 248 | 180 | 1 |
| 2017 | 0 | 156 | 39 | 0 |
| 2018 | 0 | 116 | 8 | 0 |
| 2019 | 0 | 192 | 2 | 0 |
| 2020 | 0 | 33 | 0 | 0 |
Entire content available on: https://www.cdc.gov/chikungunya/geo/chikungunya-in-the-us.html
