West Nile is climbing in Wyoming — here’s what to know

West Nile virus is ticking up across Wyoming, health officials say. As of Sept. 4, the Wyoming Department of Health has logged 11 human cases statewide, including six severe illnesses and one death. The eastern half of the state is seeing the highest activity, driven by infected mosquitoes.

Most people never feel a thing, but about 1 in 5 who get West Nile develop mild, flu-like symptoms — fever, headache, body aches. Fewer than 1% develop serious illness, which can include neck stiffness, disorientation, tremors, muscle weakness, numbness, paralysis, or even coma. Risk is higher for older adults and people with chronic health conditions.

How to lower your risk

• Dump standing water (buckets, birdbaths, gutters) and use window/door screens.
• Treat larvae where needed and keep lawns trimmed to reduce mosquito habitat.
• Cover up with long sleeves and pants; avoid dawn and dusk when mosquitoes are most active.
• Use EPA-registered repellents as directed.

For context: since 2016, 2023 was Wyoming’s worst year for West Nile, with four deaths and 13 severe cases. Human cases typically peak in July, August, and September — so vigilance now still matters.

The original story by Kamila Kudelska for Wyoming Public Radio.