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L.A. County Confirms First West Nile Virus Death of 2025

Health officials urge EPA-registered repellents, standing-water removal, screen repairs during peak mosquito season through November.

Overview

  • The patient, a San Fernando Valley resident, died after hospitalization for severe neurological illness linked to the virus.
  • County officials report 14 documented human infections this year, excluding Pasadena and Long Beach, with about half in the San Fernando Valley.
  • Los Angeles County averages roughly 56 reported cases annually in recent years, a count believed to understate true infections because many go unrecognized.
  • Researchers say drought can concentrate infected birds and mosquitoes at limited water sources, potentially heightening transmission risk in dry parts of the Valley.
  • Public guidance includes using EPA-registered repellents such as DEET or picaridin, eliminating standing water, and maintaining window and door screens as transmission typically peaks through November.