A New York resident has tested positive for the mosquito-borne illness Chikungunya virus, with state health officials saying it is the first reported transmission of the virus in the U.S. since 2019.

Empire State health officials said on Tuesday that the virus was identified in a person living in Nassau County on Long Island. In a separate statement, health officials said the person began experiencing symptoms in August after traveling outside of the region but not out of the country.