According to the CDC's website, as of 13 Jan 15, only 11 cases of chikungunya have been reported in the USA, all in Florida, that originated in the USA. The rest of the cases were came from mosquito bites outside the USA, mostly people on vacation in the Caribbean. The problem is when a sick person is bitten and passes it on to mosquitos in the states.

There is a pilot program in the Florida Keys to use GMO mosquitos to drastically lower the population of "striped-legged" mosquitos which carry chikungunya.