West Nile virus (WNv) has been detected in Jackson County for the first time this year. The virus was found in a mosquito pool collected on July 15 in Eagle Point. July through September are typically the busiest months for WNv activity in the county.
How the virus was found
A sample was collected from a mosquito pool by the Jackson County Vector Control District as part of routine monitoring. Mosquito pools are traps that can hold up to 50 mosquitoes. These pools are used statewide to check for mosquito-borne diseases that can affect people and animals, including birds and horses.
DNA testing confirmed the presence of WNv in the sample.
Protecting yourself from mosquito bites
West Nile virus spreads to humans through the bite of an infected mosquito. People are encouraged to take simple steps to reduce risk of being bitten:
- Remove or treat standing water.
- Avoid being outside at dawn and dusk when mosquitoes are most active.
- Use insect repellents that have DEET, lemon or eucalyptus oil, or Picardin (always follow label instructions).
- Wear long sleeves and pants when you’re outdoors.
- Make sure window and door screens are in good condition and fit tightly.
If you start to feel flu-like symptoms after being bitten by a mosquito, contact your health care provider, especially if you are over 50 or have health conditions like high blood pressure or diabetes. Providers can reach out to the Jackson County Health Department for details on WNv testing.
Impact on animals
WNv doesn’t only affect people. Wildlife, pets, and farm animals can also get sick.
Horse owners should make sure their animals are vaccinated for WNv. If a horse shows signs of neurological illness, it should be examined by a veterinarian. Testing for WNv in horses is available through Oregon State University.
West Nile activity in recent years
Every year, WNv is detected in Oregon, mostly in mosquito pools. Recent totals include:
- 2023: 70 mosquito pools, four horses, and 17 people
- 2024: 21 mosquito pools, no human or animal infections
- 2025: 11 mosquito pools, two horses, and two people (both human infections occurred outside of Oregon)
Want to learn more?
Visit OHA’s West Nile Virus Activity webpage or Centers for Disease Control and Prevention’s About West Nile webpage.