Health authorities in the Hudson Valley are investigating a probable case of West Nile virus infection.
The Ulster County health department says the case involves a person who'd traveled out of New York, so it isn't clear if the infection was contracted in the county.
Most people infected with the mosquito-borne virus either show no symptoms or have a mild, flu-like illness.
A small proportion develop serious illness that can lead to neurological damage.
Investigators have found water bodies with West Nile-infected mosquitoes in southern and central New York this year, but none in Ulster County.