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West Nile Virus Detected in Mosquitoes in Philadelphia and Four NYC Boroughs

Health agencies across all levels have intensified mosquito control with clinical alerts following these detections

A lab worker examines trapped mosquitoes for signs of West Nile Virus and other diseases at the Orange County Mosquito and Vector Control District laboratory in California
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Overview

  • Health surveillance teams found West Nile virus in mosquito samples near Pennypack Park in Northeast Philadelphia and in the Bronx, Brooklyn, Queens and Staten Island this week.
  • Despite positive mosquito tests across the city, New York City has not recorded any human West Nile infections in 2025.
  • The CDC reports at least 49 human West Nile cases in 15 states so far this year, including Arizona, Louisiana and Texas.
  • The Philadelphia Department of Health has notified doctors and medical facilities to watch for symptoms and report suspected cases immediately.
  • Residents are urged to eliminate standing water, wear protective clothing and use EPA-approved repellents as city agencies step up pesticide spraying.