A person living in the suburbs of New York City has tested positive for chikungunya, a mosquito-borne virus that is more often seen in South America and hasn’t been transmitted on the U.S. mainland in a decade.

Health officials said the virus, which often causes fever and joint pain, was identified in a patient on Long Island who started experiencing symptoms in August after having traveled outside of the region, but not out of the country.

The patient likely got the virus from a mosquito bite, but it isn’t clear where that happened. The virus has not been detected in local mosquito pools and isn’t spread directly from one person to another.

Here’s what to know about chikungunya:

What is chikungunya?

Chikungunya is a disease caused by a virus of the same name.

The chikungunya virus w

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