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Early, Widespread Rise in West Nile Detected as Local Agencies Intensify Control

An early surge in infected mosquito pools raises local infection risk, prompting stepped-up spraying and temporary park closures.

Overview

  • Salt Lake City officials said this week that 35% of mosquito samples in the Salt Lake City Mosquito Abatement District tested positive for West Nile virus and the county has reported two human cases.
  • Hays County confirmed its first laboratory‑verified human West Nile case after eight positive mosquito pools were recorded countywide, prompting heightened surveillance and public warnings.
  • Local responses have included twice‑nightly adulticide treatments in Manvel, temporary suspension of outdoor activities at Old National Park in South Fulton, and expanded trapping and retesting in Floyd County where three positive pools were identified.
  • Health departments stressed prevention steps people can take now—use EPA‑approved repellent, wear long clothing at dawn and dusk, eliminate standing water—and reminded residents that most infections are mild while older and immunocompromised people face higher risk.
  • Entomological signs such as positive mosquito pools often precede human cases, so officials say the early and geographically broad uptick in West Nile activity this season could signal more localized cases and ongoing vector‑control operations through the summer.