Extremely Dangerous Virus Now Confirmed in Idaho, Utah, and Washington

One of the most well-known viruses in the world has been confirmed in Idaho, Washington, and Utah within the last few days.

West Nile Virus is commonly carried by mosquitoes and can be transmitted to humans and other animals. The virus often causes severe illness or minor to no symptoms in humans.

Deadly Virus Now Confirmed in Parts of Idaho, Washington, and Utah

But humans should be aware of and avoid possible infection, as the virus is deadly to a small percentage of people. Reports show that 70 to 80 percent of humans infected with West Nile will be asymptomatic (show no signs of sickness). Those with symptoms experience headache, weakness, rash, or gastrointestinal symptoms. The fatality rate of West Nile is about 10 percent.

With verified cases now in Idaho, Washington, and Utah, people should take precautions to avoid mosquito bites.

Which Parts of Utah, Washington, and Idaho Have West Nile in 2025

West Nile Virus has been detected in mosquito groups in:

• Salt Lake City, Box Elder, Cache, Uintah, and Utah Counties in Utah.
• Canyon County in Idaho
• Yakima in Washington State

These locations have confirmed cases of West Nile in mosquitoes.

How Many People Have West Nile Virus in 2025 in ID, WA, and UT

According to online reports, including data from state health departments and the CDC, there have been no cases of human infection with West Nile Virus this year in the Pacific Northwest.

This information is based on reports with information that can and will change as more cases are found and reported.

READ MORE: What Do Baby Mosquitoes Look Like?

You can do your part to lessen the number of mosquitoes in your area by eliminating standing water where possible. For existing mosquitoes, some believe the color of clothing you wear can deter, or attract, them. Repellant should also be used whenever possible.