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West Nile Virus Update - August 27, 2021

PDF - 20210827_WNV Update

Los Angeles County (August 27, 2021) – The Greater Los Angeles County Vector Control District (GLACVCD/District) has confirmed seven (7) additional mosquito samples that tested positive for West Nile virus (WNV). This brings the total number of positive samples within the District’s service area to 26 this year. The new positive samples were collected from four new areas: San Marino, Santa Clarita, Van Nuys, and Whittier.

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View full list of cities and communities with confirmed WNV activity

West Nile virus is endemic to Los Angeles County, and warm temperatures can increase virus activity and mosquito populations. As of August 27, 2021, 19 WNV human cases have been reported in California this year, one of which was identified by the Los Angeles County Department of Public Health (LACDPH). Visit VectorSurv Maps for a comprehensive look at this year’s West Nile Virus activity throughout Los Angeles County and Southern California.

  • Mosquito control is a shared responsibility and residents must take an active role in reducing the threat of WNV in their neighborhoods by taking these additional steps:
  • Eliminate standing water in clogged rain gutters, rain barrels, discarded tires, buckets, watering troughs or anything that holds water for more than a week.
  • Ensure that swimming pools, spas, and ponds are properly maintained.
  • Change the water in pet dishes, bird baths and other small containers weekly.
  • Wear EPA-approved and CDC-recommended insect repellent when outdoors where mosquitoes may be present.
  • Report neglected (green) swimming pools in your neighborhood to your vector control district.
  • Share this information with your community to decrease mosquito populations.

For an extensive list of sources and recommended solutions, visit For more information, residents can contact the Greater Los Angeles County Vector Control District at 562-944-9656, online at, or on social media: Facebook, Twitter, Instagram


Media Contact:

Anais Medina Diaz, Public Information Officer |

Mary-Joy Coburn, Director of Communications |