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NewsNBC Los Angeles (KNBC) – LocalJune 30, 2026United States

West Nile Virus Found in San Gabriel Valley Mosquitoes

Health officials have confirmed the first mosquitoes carrying West Nile virus in the San Gabriel Valley this year, specifically in the city of Alhambra. Residents are encouraged to take preventative measures against mosquito bites as warmer weather increases virus transmission risks.

public healthmosquito controlWest Nile virusSan Gabriel Valley
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Why It Matters

Residents in the San Gabriel Valley face an increased risk of West Nile virus exposure, requiring them to take active steps to eliminate standing water and use insect repellent to prevent bites.

Key Facts

  • The first West Nile virus-positive mosquito sample of the year in the San Gabriel Valley was collected in Alhambra.
  • The San Gabriel Valley Mosquito & Vector Control District is conducting ongoing surveillance and treatment in public areas.
  • There is currently no cure or human vaccine for West Nile virus.
  • Approximately 1 in 5 infected people develop symptoms like fever, headache, or rash.
  • Approximately 1 in 150 infected people develop severe illness requiring hospitalization.
  • Older adults and individuals with weakened immune systems are at the highest risk for serious complications.
  • The district recommends emptying standing water containers weekly and using CDC-approved repellents like DEET, picaridin, oil of lemon eucalyptus, or IR3535.
  • Virus activity typically increases during warmer months due to faster mosquito breeding cycles.

Who's Mentioned

organizationSan Gabriel Valley Mosquito & Vector Control District“The agency responsible for monitoring and controlling mosquito populations in th”organizationLos Angeles County Department of Public Health“Provided information regarding the transmission and symptoms of West Nile virus.”locationAlhambra“The city where the infected mosquito sample was collected.”personTristan Hallum“Director of Scientific Programs for the San Gabriel Valley Mosquito & Vector Con”