Parts of Palo Alto and Mountain View are receiving mosquito control treatment after county detects West Nile virus

Santa Clara County’s Vector Control District will conduct mosquito control treatment in parts of Palo Alto and Mountain View Friday after West Nile virus was found in mosquitoes in those areas.

The Vector Control District announced the positive mosquito cases and treatment plans on Wednesday. Affected areas include neighborhoods near West Middlefield Road and San Antonio Road in portions of zip codes 94043, 94303, and 94306.

The mosquito control treatment begins on Friday around 10 p.m. and lasts about three hours.

An interactive map showing the treatment area is available online at

Residents of the areas do not have to move, according to the Vector Control District, as the treatment poses minimal risk to people and pets.

If you want to be extra careful, you can stay inside and close the windows and doors. Treatment involves a low volume insecticide approved by state and state environmental protection agencies that are widely used by vector control agencies across California.

This is not the first time this year the West Nile virus has been detected in mosquitoes in Santa Clara County. The district discovered cases and treated areas of Santa Clara and Sunnyvale in late August.

In 2021, California has seen 35 human cases of the West Nile virus so far, but none specifically in Santa Clara County. Since 2003, the West Nile virus has infected over 7,000 people nationwide and caused 339 deaths.

West Nile virus is safe for most people and usually does not cause symptoms. However, some people may experience a fever, headache, or body aches. In rare cases, the virus can cause neurological damage or death.

The Vector Control District regularly monitors areas to detect diseases transmitted by mosquito bites such as the West Nile virus, and then clean up all sources of the mosquito brood.

Mosquitoes lay their eggs and spend most of their lives in stagnant water. People can reduce mosquito breeding sources by draining or draining stagnant water weekly, turning over any containers that can hold water, or fixing leaky faucets or sprinklers.

To protect against mosquito bites, the Vector Control District recommends the use of security bars on doors and windows. Because mosquitoes that carry West Nile virus are most active around dusk and dawn, people can also limit outdoor activities, wear long sleeves in bright colors, or apply insect repellent during these times.

Questions can be directed to the district’s vector control staff via the West Nile Virus Hotline at (408) 282-3114 Monday through Friday from 7:30 a.m. to 4:30 p.m. or by emailing [email protected] will.

To report a potential source of mosquito breeding or for help with mosquito control, contact the Santa Clara County Vector Control District at (408) 918-4770 or complete a service request online at .

For more information on mosquito control treatment, visit the Vector Control District website at

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