Although we’ve seen imported cases of Chikungunya into the United States, thus far onward transmission via local mosquito vectors has not been documented. Of course, the same could have been said about the West Nile Virus prior to the late 1990s, and Dengue before 2009.
The most competent vector for the virus is the Aedes Albopictus mosquito (followed by the Aedes aegypti), which arrived in the United States in the 1980s, and can now be found across a wide swath of the country.
via Avian Flu Diary: Chikungunya Update & CDC Webinar Online.

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