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last mo.

First Human West Nile Cases Confirmed in Massachusetts and Delaware County as Mosquito Positives Surge

Health officials say elevated mosquito activity will keep infection risk high until the first hard frost.

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Overview

  • Massachusetts confirmed its first 2025 human case in a woman in her 70s who was exposed in Middlesex County.
  • Delaware County, Pennsylvania, reported its first human infection of the year, with no patient details disclosed.
  • The Philadelphia region now has six human cases this season, with two in Bucks County and one each in Philadelphia, Delaware, Montgomery, and Chester Counties.
  • Surveillance remains elevated, with 319 West Nile virus–positive mosquito samples reported across 12 Massachusetts counties and 108 positives in Delaware County, officials said.
  • Public health agencies urge EPA-registered repellents, long sleeves, removing standing water, and avoiding dusk-to-dawn outdoor exposure, noting risk will persist until a hard frost.