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LA County Reports Highest Number of West Nile Virus Cases Since 2017

Nearly all patients had severe illness, and officials urged residents to use mosquito repellent and remove standing water.

  • On Tuesday, Los Angeles County reported 100 West Nile virus cases and five deaths, marking the highest infection count seen this early in the season in nearly a decade.
  • Activity levels have not been seen since 2017, when 268 cases were reported over the entire mosquito season, positioning the county on track for one of its most severe seasons in recent years.
  • According to the Los Angeles County Department of Public Health, nearly all patients this year suffered severe illness affecting the brain or spinal cord and required hospitalization.
  • Los Angeles County Health Officer Muntu Davis warned the county remains in peak transmission season, urging residents to "use insect repellent, eliminate standing water where mosquitoes can breed and ensure windows and doors have tight-fitting screens without holes or tears."
  • Enhanced surveillance, mosquito-control treatments, and public outreach are underway to combat elevated virus activity, San Gabriel Valley Mosquito and Vector Control District Manager Jason Farned said.
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LA County sees highest number of West Nile virus cases in nearly a decade

Closeup of a mosquito. (Getty Images stock photo) (NEW YORK) — Los Angeles County is seeing the highest number of West Nile virus cases in nearly a decade, health officials said Monday. The county has reported 100 cases

·Baltimore, United States
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NBC LA broke the news in Los Angeles, United States on Monday, September 21, 2026.
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