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Fogging to Suppress West Nile Virus Mosquitoes Scheduled in South San José


SAN JOSÉ, CALIF. – The Santa Clara County Vector Control District (SCCVCD) confirmed on 9/9/2011 that adult mosquitoes collected from south San José tested positive for West Nile virus (WNV). The detection of mosquitoes infected with WNV has prompted the scheduling of a mosquito fogging treatment in the surrounding area, in an effort to prevent human cases of WNV. Weather permitting, the ground fogging is scheduled for Wednesday, September 14, at 11:00 p.m., and is planned to last for several hours.

Acting District Manager Russ Parman notes that “West Nile virus continues to be active in mosquitoes in the south San José area, so it is important to keep the numbers of mosquitoes as low as possible. Estimates are that from one to three percent of the mosquitoes in this area are carrying the virus.” The fogging area is generally bordered by Hillsdale Avenue on the north; Pearl Avenue, Kenton Lane, Glenmont Drive, and Windfield Boulevard on the west; Monterey Avenue, Apple Blossom Drive, Lean Avenue, and Dunn Avenue on the east; Curie Drive and Foothill Drive on the south. A live map can be viewed at

Information packets has been distributed in the fogging area over the weekend to notify residents about the fogging operation. As an added convenience, on Tuesday and Wednesday, September 13 and 14, staff from the Santa Clara County Vector Control District and the Public Health Department will be available during extended hours from 7:30 a.m. to 7:00 p.m. via a dedicated phone line/voicemail (800-314-2427) to answer questions and provide information.

Transmitted by mosquito bites, WNV causes mild to severe flu-like symptoms such as fever, headache, body aches, and, in severe cases, significant neurological damage or even death. The elderly and those with compromised immune systems are most susceptible. Since the arrival of WNV in California in 2003, 3,021 people across the State have contracted the disease.

Vector Ecologist Nayer Zahiri said, “We have a very persistent focus of virus amplification here since the beginning of August; this duration of activity in a single area hasn't been seen since 2007. Residents throughout Santa Clara County should avoid mosquito bites, and keep an eye out for standing water which can harbor mosquitoes.”

Some practical measures against mosquito bites are:

At home:

  • DRAIN or DUMP standing water weekly since this is where mosquitoes lay eggs. Check items such as flowerpots and planter bases, toys, cans, leaky water faucets and sprinklers, rain gutters, buckets, pools, ponds, and old tires.
  • Make sure your DOORS and windows have tight-fitting screens.


  • Limit outdoor activities during DUSK & DAWN to prevent mosquito bites. Those are the times when the mosquitoes that transmit WNV are most active.

If you need to go outside at dusk or dawn, or when in an area where mosquitoes are active:

  • DRESS in long sleeve shirts and long pants, preferably of light colors.
  • Apply insect repellent following label instructions.

Always contact the Vector Control District if you are being bothered by mosquitoes or know of a potential mosquito-breeding source.

Dead birds may indicate the presence of WNV. The District has recently completed its new laboratory, which allows in-house testing for WNV and other vector-borne diseases throughout the year. The District asks Santa Clara County residents to report crows, jays, or birds of prey that have been dead for less than 48 hours and do not appear to have died because of an injury. People who find those birds should call the State of California WNV hotline at 877-WNV-BIRD (2473) or at

Residents can visit the District’s website at to view a map of the fogging zone, read the latest alerts about WNV activity in the County, and request advice or services.

For free assistance on mosquito control, WNV, or other vectors, residents can contact the District office by calling (408) 918-4770/(800) 675-1155 or fill out a service request online at

Treatment Zone (September 14, 2011)

Media Contact: Russ Parman (408) 593-6176 English, Noor Tietze (408) 210-5773 English, Victor Romano (408) 593-6193 English, José Colomé (408) 210-5774 English and Spanish
Posted: September 12, 2011