Napa County authorities reported yesterday the first case of a bird testing positive for West Nile virus in the county this year.
Napa County Public Health Officer Dr. Karen Smith said a snowy egret was found in southeast Napa on June 29. The county received confirmation on Wednesday night from the Health Services lab at the University of California, Davis that the bird tested positive for the virus transmitted by mosquitoes.
Napa County Mosquito Abatement District Director Wesley Maffei said six birds tested positive for the virus last year and there have been no human cases reported in Napa County.
"Thirty-five California counties have reported West Nile virus activity this year and three people have been infected with the virus in the state," Smith said.
Health officials again urged residents to remove standing water where mosquitoes breed from around their homes and properties, including water in old tires, birdbaths, gutters and flower pots.
"Human illness from the virus is rare and 80 percent of the people who are bitten by a mosquito with the virus will not get sick, officials said. Another 10 to 15 percent of infected individuals will have mild to moderate symptoms, such as fever, headache and body aches. The elderly and those with lowered immune systems are more susceptible to serious illness," health officials said.
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