West Nile Virus Detected in Jackson County Mosquitoes for First Time This Year

EAGLE POINT, Ore. (Jul. 18, 2026) — West Nile virus has been detected in mosquitoes collected in Eagle Point, marking the first confirmed detection of the virus in Oregon during 2026, state health officials announced.

The infected mosquito pool was collected July 15 by the Jackson County Vector Control District as part of its routine mosquito surveillance and DNA testing program. July through September are considered the peak months for West Nile virus activity in Jackson County.

Mosquito pools are traps that can contain up to 50 mosquitoes. Vector control districts across Oregon use the traps to monitor for mosquito-borne diseases that can affect people, horses and wildlife.

The Oregon Health Authority and the Jackson County Vector Control District are urging residents to take precautions to avoid mosquito bites, as West Nile virus is transmitted to humans through infected mosquitoes.

Health officials said people who develop flu-like symptoms after being bitten by mosquitoes should contact their health care provider, particularly adults older than 50 and those with underlying health conditions such as high blood pressure or diabetes. Health care providers can work with the Jackson County Health Department to arrange West Nile virus testing when appropriate.

The virus can also infect wildlife, horses and other animals. Officials recommend horse owners ensure their animals are vaccinated against West Nile virus and seek veterinary care if horses develop neurological symptoms. Testing for horses is available through Oregon State University.

Residents are encouraged to reduce mosquito populations around their homes by eliminating or treating standing water where mosquitoes breed. Officials also recommend avoiding outdoor activities at dawn and dusk, when mosquitoes are most active, using insect repellents containing DEET, oil of lemon eucalyptus or picaridin, wearing long-sleeved shirts and pants outdoors, and ensuring window and door screens are in good repair.

West Nile virus is detected in Oregon every year, most often in mosquito pools rather than people or animals. In 2023, the virus was identified in 70 mosquito pools, four horses and 17 people. In 2024, officials detected the virus in 21 mosquito pools but reported no human or animal infections. Last year, the virus was found in 11 mosquito pools, two horses and two people, though both human infections were acquired outside Oregon.