Mosquitoes found in Northwest Franklin County have tested positive for the West Nile virus.
The insects collected on North Wahluke Road were in the first mosquito pool to test positive in the county this season, David Dorsett, director of the Franklin County Mosquito Control District, said in a news release.
The agency traps and tests mosquitoes across the county each week.
Last week, mosquitoes trapped in Prosser and Mabton also tested positive. The virus also was detected in Grandview.
People should wear long pants and long-sleeved shirts, as well as insect repellent containing DEET, when outside in early mornings and evenings, Dorsett said.
"West Nile virus is typically most active this time of year and protecting yourself from being bitten is the only way to insure that you won't contract the virus," he said.
On Wednesday, the mosquito control district began air and ground treatments of the area where the virus was found and will continue that work Thursday.
Most people bitten by a West Nile-carrying mosquito won't get sick, but in some cases it can be serious and even fatal, said officials.