WEST CHESTER TWP. — After a mosquito pool here tested positive for the West Nile virus, health officials Wednesday said they were taking more steps to prevent the virus from being transmitted to people.

        Patricia Burg, director of the Butler County Health Department, said an additional mosquito trap was added near the Princeton Village trailer park on Princeton-Glendale Road. Officials had set the first trap there after a bird tested positive. Traps are also set in four other sites in the county, she said, but the West Chester pool was the first to yield a positive result.

        Within the past few months, Butler County has sent 15 bird carcasses to be evaluated; positive results came from two in West Chester and one in Morgan Township, Ms. Burg said. Officials also plan to begin trapping live birds for tests.

        Although there has been no spraying, officials are setting donut-shaped devices into stagnant water to kill mosquito larvae for 30 days.

        The West Nile virus can cause potentially fatal inflammation of the brain and spinal cord, and tends to show up in crows or blue jays before hitting humans. Cleveland's Cuyahoga County has one of the state's highest counts of dead birds with West Nile: 16.

        No Ohioan has tested positive for the virus, which afflicted 66 people in 10 states last year; nine died. Fewer than 1 percent of mosquitoes carry the virus, and fewer than 1 percent of the people bitten become infected, authorities say.

        The Associated Press contributed to this story.

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