Mosquito Pool Tests Positive for West Nile Virus

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Source: County of Ventura

On September 19, 2017, the Ventura County Environmental Health Division (Division) received confirmation from the California Department of Public Health that mosquitoes collected the first week in September from the City of Simi Valley Wood Ranch Marsh area tested positive for West Nile Virus (WNV). These are the first mosquitoes collected in 2017 to test positive for WNV in Ventura County. In addition, one bird tested positive for WNV in the Simi Valley area this year. WNV is established in Ventura County and additional WNV positives are expected.

The Division monitors and controls mosquito breeding sources throughout 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.

The Division also advises the public to take the following precautions to minimize exposure to WNV: 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 and limit activity especially at dawn and dusk; when outdoors apply insect repellent.

WNV can not only affect humans but can also affect horses. For information on WNV in horses, the owners should contact their veterinarian.

To report any potential mosquito breeding sources in Ventura County the public can call the mosquito complaint HOTLINE at 805/658-4310. The Division also provides mosquito eating fish to the public to use in non-maintained swimming pools, ornamental ponds and similar water features. To request mosquito-eating fish call 805/662-6582. To report wild birds that have died recently call the California Department of Public Health at 877/WNV-Bird (877/968-2473).

To obtain information about mosquito control and surveillance efforts in Ventura County please visit the Division’s website:

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420722 Sep 20, 2017 05:52 PM
Mosquito Pool Tests Positive for West Nile Virus

Tagdes-when did you find the time to test all 2700 species of mosquitos to confirm that? I'm calling keyt, you need a trophy or some sort of recognition for that.

tagdes Sep 20, 2017 09:13 PM
Mosquito Pool Tests Positive for West Nile Virus

You only need to find one that doesn't to say that not all of them carry some sort of disease so luckily I did not have to spend a lot of time. Having said that... I do have a trophy wall in my man cave.

laughing Sep 20, 2017 05:17 PM
Mosquito Pool Tests Positive for West Nile Virus

Usually Santa Clara River / River Mouth Area is the stepping stone to the South Coast. Beware sudden increase or unusual number of dead birds on the ground especially around lakes ponds and stagnant creeks.

tagdes Sep 20, 2017 04:31 PM
Mosquito Pool Tests Positive for West Nile Virus

You are correct about what you know. First of all of the 2,700 types of mosquitoes... not all carry some sort of disease. More importantly this is not scare tactics, 3 people in So Cal have died from West Nile Virus this year and left unchecked the problem will only get worse.

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