HERMISTON — Umatilla County officials have detected the West Nile virus in a mosquito sample, the West Umatilla Mosquito Control District reported Thursday, Aug. 10.

According to a press release, the mosquitoes were captured Aug. 3 near Dallas Road east of Hermiston. Subsequent testing at Oregon State University’s Veterinary Diagnostic Laboratory in Corvallis confirmed the virus in the sample, resulting in the county’s first detection this year.

Area residents can expect to see an increase in mosquito control operations. Ultra-low-volume applications of insecticides from truck-mounted sprayers will be used to reduce mosquito populations. These applications will typically be made after sunset when mosquitoes are most active. All applicators are licensed by the Oregon Department of Agriculture.

West Nile is primarily a bird disease, and some birds, including magpies, blue jays and crows are especially susceptible. Mosquitoes become infected by feeding on an infected bird and can pass the virus to humans, horses or other hosts. The public is encouraged to continue alerting district officials when they come across dead birds so the spread of the virus can be tracked.

According to the release, the risk of the West Nile virus is low, but people are asked to take appropriate protective precautions. Most who become infected with the virus do not become ill. Some may develop mild flu-like symptoms such as fever, headache, body aches and occasionally swollen lymph glands or a rash.

In rare cases, West Nile may cause encephalitis, or inflammation of the brain, the release states. Anyone suffering severe or unusual headaches as a result should seek medical care as soon as possible.

Some suggestions to reduce the risk of exposure to diseases such as West Nile virus include:

• Get rid of old tires and other containers where water can accumulate and serve as a breeding ground for mosquitoes.

• Flush or replace water in horse troughs weekly.

• Be sure to flush or add mosquito fish to ornamental ponds.

• Avoid outdoor activities at dusk and dawn when mosquitoes are most active.

• Wear long-sleeved shirts and long pants in mosquito-infested areas.

• Use mosquito repellents containing DEET, picaridin or oil of lemon eucalyptus and make sure to follow directions.

• Screen doors and windows.

• Report mosquito infestations and dead-bird sightings to the West Umatilla Mosquito Control District at 541-567-5201.

According to the release, because horses are also at risk for West Nile, owners are encouraged to check for vaccinations with their veterinarians, who can test the animals at OSU at no cost.

For updates on the West Nile virus in Umatilla County, visit shorturl.at/htAPZ.