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September 3, 2013 > West Nile Virus Mosquitoes found in Milpitas, San Jose

West Nile Virus Mosquitoes found in Milpitas, San Jose

Submitted By SCC Public Affairs

The Santa Clara County Vector Control District (SCCVCD) confirmed on August 30, 2013 that adult mosquitoes collected from the 95035 ZIP code areas of the city of Milpitas and from the 95131 and 95112 ZIP code areas of the city of San Josˇ tested positive for West Nile virus (WNV).

The detection of mosquitoes infected with WNV has prompted the scheduling of mosquito fogging treatment in the two areas, in an effort to prevent human cases of WNV. Weather permitting, the two ground fogging operations are scheduled for Wednesday, September 4, at 11:00 p.m., and is planned to last for several hours.

"With these two fogging operations, the District will have treated over 30 square miles of territory, which is a record number in a single season," noted Acting District Manager Russ Parman. "Over the Labor Day weekend, residents across the County should continue to avoid mosquito bites and remove standing water from around the home."

The Milpitas fogging area is generally bordered by Valmy St. and Coelho St. on the north; Acadia Ave. and Shenandoa Ave. on the south; the Amtrak railroads corridor on the west; and Piedmont and Evans Rd. on the east. A live map can be viewed at The San Jose fogging area is generally bordered by Rock Ave. and Charcot Ave. on the north; Berryessa Rd. and Hwy 101 on the south; Zanker Rd. on the west; and Rue Avati and Automation Pkwy on the east. A live map can be viewed at

Information packets notifying residents about the fogging operation will be distributed in the fogging areas starting on Saturday, August 31. As an added convenience, on Tuesday and Wednesday from 7:30 a.m. to 7 p.m. staff from the SCCVCD will be available at (408) 918-3452 or (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 2003 arrival of WNV in California, 3,684 people across the State have contracted the disease; 134 of those cases were fatal.

"Using preventive measures such as insect repellent to avoid mosquito bites when outdoors can help decrease the risk of contracting this disease, and that's especially important this season. We haven't seen this much virus activity since 2007, which was our last 'big' year following the arrival of WNV in 2004," said Scientific / Technical Services Director Dr. Noor Tietze.

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 or fill out a service request online at

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