SAN DIEGO -- Another 10 dead birds discovered around San Diego County have tested positive for West Nile virus, bringing the total number to 39 this year, county health officials reported Tuesday.

The latest finds were made in Bonsall, Fallbrook, Vista, Oceanside, Carlsbad, Cardiff, Kearny Mesa and Bonita, according to the San Diego County Department of Environmental Health.

"We are finding more evidence of the virus in urban areas rather than rural and mountain areas," said Gary Erbeck, director of the DEH.

"West Nile virus is a preventable disease," he said. "You should protect yourself by using insect repellent, as well as inspect your backyard each weak for mosquito breeding areas."

Dead birds can be reported, and more information on West Nile virus obtained, on the county's Web site at www.SDFightTheBite.com, or by calling 888-551-INFO (4636).