||Last Updated: Nov 12th, 2006 - 20:38:00
Aug 24 (foodconsumer.org) - The Contra Costa country health officials have confirmed three human cases of West Nile virus (WNV) and one West Nile death in the county.
Last year there were 11 human cases of West Nile virus in Contra Costa County. In California this year, there have been 84 human cases of WNV infections.
In a continuing effort to counter the West Nile virus activity, Contra Costa Mosquito & Vector Control District will conduct aerial spraying in waterfront areas Thursday tonight, the county officials said.
In the meantime, twenty-four sentinel chickens in three flocks located in Martinez, Holland Tract, and Oakley have tested positive for West Nile virus, the first indication of sentinel chicken infections in Contra Costa County this year.
The Contra Costa Mosquito & Vector Control District monitors sentinel chickens for West Nile virus as one way to assess the WNV activity in the county.
Aerial spraying for adult mosquitoes, which is the major vehicle for the transmission of West Nile virus, from Martinez to Pittsburg along the waterfront will be made tonight by helicopter using Pyrenone 25-5, a botanical pesticide, applied at a rate of 0.75 ounces per acre. Spraying will take place at approximately 7:30 p.m., weather permitting, the county announced Thursday August 24.
"Our surveillance indicates large numbers of mosquitoes in this area," said Deborah Bass, public affairs manager for the Contra Costa Mosquito and Vector Control District. "Spraying by helicopter is an efficient and effective way to kill adult mosquitoes."
For more information about spraying for adult mosquitoes in your neighborhood, visit the district's website at www.ccmvcd.dst.ca.us or call (925) 685-9301 for a recorded message.
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