The first positive test for West Nile virus this season was found in Suffolk County. County officials say the mosquito sample was collected in Nesconset on July 1. Most people bitten by an infected mosquito will suffer mild or no symptoms.

Monroe and Westchester counties have reported 20 and 66 West Nile virus infections, respectively, over the past two decades. But the illness goes underreported, in part, due to the fact most mild ...