chikungunya

While some Americans worried that Ebola would spread around the U.S., a new mosquito-borne virus flew right in. It sickened more than 2,000 Americans and nearly a million people across the Caribbean.

It's called chikungunya. And it causes severe joint pain that can last for months. A quarter of a million people have caught the virus in the Caribbean. So how big a problem will it be stateside?