West Nile Virus Testing in Wyoming, Utah and Idaho

If you think you have a West Nile Virus rash or you’ve noticed other West Nile Virus symptoms, Sterling Urgent Care is here to help. We offer quick and accessible West Nile Virus testing throughout Utah, Idaho and Wyoming. With walk-in clinic locations in cities such as Idaho Falls, Rock Springs and Logan, our practitioners are available to administer a West Nile Virus blood test and walk you through treatment possibilities.

Visit our urgent care clinics in Wyoming, Utah and Idaho  for a West Nile Virus test. You can also arrange a telemedicine appointment to evaluate possible West Nile Virus symptoms to see if a test is necessary.

Did you know?

After a West Nile Virus mosquito bite:

  • 8 out of 10 people who are infected with West Nile Virus do not develop symptoms.
  • Approximately 1 in 5 people with West Nile Virus experience symptoms including the following:
    • Fever
    • Vomiting
    • Joint Pain
  • These people usually make a full recovery.
  • 1 in 150 infected persons can have long-lasting symptoms and side effects that include:
    • Paralysis
    • Coma
    • Vision Loss

West Nile Virus can be fatal. If you suspect that you have been bitten by an infected mosquito, we encourage you to get a West Nile Virus test.

Pregnant women and nursing mothers can transmit West Nile Virus to infants during childbirth or breast feeding. If you are pregnant or nursing, you and your child should get tested.

State-Specific West Nile Virus Reporting and Guidance

The links below provide up-to-date information on West Nile Virus outbreaks in Idaho, Utah and Wyoming, as well as links to state resources for mosquito control.

There have been no updates to state-level West Nile Virus reporting in Idaho, Utah or Wyoming since the end of September 2020. As of October 23, 2020, West Nile Virus season has likely passed with the first hard frost across these states. We do not anticipate any further updates of case counts or monitoring in 2020, but we will update the site with any new West Nile Virus information.



One mosquito pool in Goshen County tested positive for West Nile Virus. As of October 8, 2020, it is the only positive mosquito pool test in Wyoming. One animal has tested positive in Fremont County. No human cases have been reported.

Wyoming West Nile Virus Activity



As of September 23, there have been 42 mosquito pools that tested positive for West Nile Virus. These pools were located in Cache, Davis, Grand, Salt Lake, Tooele and Uintah counties. There have been fewer than 5 human cases in Utah, all in Davis County. Utah has not updated their West Nile Virus tracking since the September 23 report.

Utah West Nile Virus Update for September 23, 2020


Five human cases of West Nile Virus in Idaho were reported, with two imported cases in Ada County and one case each in Gem, Gooding and Owyehee counties. One crow from Ada County, one horse from Gem County and one horse from Gooding County tested positive in a lab. Positive mosquito pool tests were recorded in Ada, Canyon, Elmore, Gem and Payette counties.

2020 West Nile Virus Surveillance Summary – 9/25/2020

Answers to Common West Nile Virus Questions

What is West Nile Virus?

West Nile Virus is a mosquito-borne virus that can lead to severe health issues. While most cases are asymptomatic, some West Nile Virus infections cause illness with symptoms such as fever, body aches, swollen glands and headache. People with weakened immune systems and underlying medical conditions, and those over the age of 60, are most at risk for severe infections.

How is West Nile Virus transmitted?

West Nile Virus transmission occurs through mosquito bites. There’s no evidence that you can contract WNV from other humans or animals.

Do all mosquitoes transmit West Nile Virus?

No, not all mosquito species transmit West Nile Virus, though other mosquito species in the area can spread different mosquito-borne illnesses.

How long after the bite does it take West Nile Virus symptoms to appear?

West Nile Virus incubation period is 5 to 15 days from the mosquito bite.

What are West Nile Virus symptoms in humans?

The main symptoms of West Nile Virus include swollen glands, headache, body aches and fever. However, more serious infections can cause severe illnesses that affect the central nervous system including encephalitis or meningitis. These serious West Nile Virus symptoms include disorientation, muscle weakness, numbness, neck stiffness and convulsions. West Nile Virus symptoms in adults last anywhere from a few days to permanent neurological effects.

Is there a West Nile Virus test?

West Nile Virus antibody testing is available at our Utah, Idaho and Wyoming urgent care clinics. The MNV-specific IgM antibodies can usually be detected 3 to 8 days after the onset of illness. These antibodies are present for 30 to 90 days after onset. However, WNV IgG antibodies can be detected after IgM antibodies, as they persist for years. The West Nile Virus blood test detects antibodies regardless of whether the infection was symptomatic of asymptomatic.

Can West Nile Virus be treated or cured?

West Nile Virus treatment involves treating specific symptoms to help with recovery from serious infections. There is currently no West Nile Virus vaccine for humans. Most patients with non-neuroinvasive WNV recover completely, though fatigue and weakness can last weeks or months.

How can I prevent West Nile Virus?

West Nile Virus prevention is simple: reduce the risk of being bitten. There are several steps you can take to reduce contact with mosquitoes:

  1. Avoid being outdoors at dusk and dawn, when mosquitoes are most active.
  2. Cover your skin. Wear shirts and pants with tight cuffs to prevent mosquito intrusion.
  3. Use an insect repellent with DEET on any exposed skin. Outdoor workers should consider treating clothes with a lasting insect repellent as well.
  4. Use screens on all open windows in homes and offices. Check screens for holes and window frames for gaps. Ensure there are no gaps around air conditioning units.
  5. Remove all standing water around your property. Mosquitoes can breed in tiny amounts of water, such as rain caught in a discarded tire or shallow dish.

Do you own a business in Idaho, uTAH OR WYOMING? For a limited time, Sterling is waving employee membership fees for 3 months for companies that sign up for a Sterling Employer Membership.

Offer available only to new Sterling Employer Membership clients.