West Nile virus detected in Garfield County mosquitoes – Garfield County, Colorado
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A mosquito biting a person's hand.

West Nile virus detected in Garfield County mosquitoes

Take precautions to avoid being bitten this summer

COMMUNITY NOTICE
June 23, 2026

West Nile virus has been detected in mosquitoes in Battlement Mesa. The detection is part of a county effort to control the population of mosquitoes that carry viruses. Each summer, Garfield County Public Health traps and tests adult mosquitoes. In identified risk areas, mosquito larvae are treated to reduce mosquito populations.

West Nile virus is transmitted to people through mosquito bites. Because West Nile can be a serious illness, it is important to take precautions.

“West Nile is spread when mosquitoes feed on infected birds and then feed on humans,” said Garfield County Public Health Director Joshua Williams. “These mosquitoes tend to live in stagnant standing water, which is why homes near wetland areas or agricultural spaces tend to see more of the virus. We are asking people to take precautions when they are outdoors so that they don’t become sick with the virus.”

Take precautions
Use insect repellents, like ones that contain DEET, when you go outdoors. Visit the Environmental Protection Agency’s insect repellent page to view a list of recommended repellents and safety tips. Follow label instructions.

Limit outdoor activities at dusk and dawn, which is when mosquitoes are most active.

Wear protective clothing, such as loose-fitting long pants, long-sleeved shirts, and tall socks. Mosquitoes can bite through tight clothes, so loose-fitting clothes provide better protection.

Around the home
Drain standing water around your house at least once a week. Empty water from tires, cans, flowerpots, clogged gutters, rain barrels, birdbaths, toys, and puddles. Install or repair screens on windows and doors.

Symptoms and treatment
The time between when a person is bitten by an infected mosquito to when they experience symptoms is usually 2-6 days but can be up to 14 days. Most people who are infected with West Nile virus will not have any symptoms. About one in every five people infected with West Nile virus will develop an illness that may include headache, muscle aches, joint pain, rash, or gastrointestinal symptoms.

Older adults and those who are immunocompromised are at increased risk of severe illness. Talk with a health care provider if you experience new or worsening symptoms of illness, including severe headaches or confusion.

There is no treatment for West Nile virus, but mild illness usually improves on its own. Prevention is key, especially for people at higher risk. Rest, fluids, and over-the-counter pain medications may relieve some symptoms.

Garfield County provides weekly mosquito trap data online on the Garfield County Mosquito Control page.