Mosquito pool in Ventura County tests positive for West Nile Virus

SIMI VALLEY, Calif. - A pool of mosquitoes collected the first week of September 2017 from the Simi Valley Wood Ranch Marsh area has tested positive for West Nile Virus.

The Ventura County Environmental Health Division, which monitors and controls mosquito breeding sources throughout Ventura County, confirmed the news on Wednesday.

Health Division officials said this group of mosquitoes are the first pool collected in 2017 that test positive for the virus in Ventura County.

"All mosquito breeding sources in the area where these mosquitoes were collected will be inspected and treated if evidence of mosquito breeding is observed," said the Health Division in a statement.

West Nile Virus can not only affect humans but also horses. Health officials encourage horse owners to be vigilant and contact their veterinarian for more information on West Nile Virus in horses.

The Ventura County Environmental Health Division advises residents to take the following precautions to minimize exposure to West Nile Virus:

  • Eliminate standing water from your property
  • Make sure doors and windows have tight-fitting screens without holes
  • When outdoors, wear long pants and long-sleeved shirts
  • Limit activity especially at dawn and dusk
  • When outdoors, apply insect repellent


Call the mosquito complaint hotline at 805-658-4310 to report any potential mosquito breeding sources in Ventura County. The Health Division also provides residents with mosquito-eating fish to use in non-maintained swimming pools, ornamental ponds, and similar water features. To request these mosquito-eating fish, call 805-662-6582.

To report any wild birds that have died recently, call the California Department of Public Health at 877-968-2473.

For more information about mosquito control and surveillance efforts in Ventura County, visit

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