CHEYENNE -- The Wyoming Department of Health (WDH) is reminding residents to be cautious about mosquito bites due to ongoing West Nile Virus (WNV) activity.

As of Sept. 4, 2025, 11 people have been reported with WNV, including six with severe disease and one death.

“We are still seeing a lot of WNV activity in Wyoming,” said Courtney Tillman, Epidemiologist at the WDH. “We want to remind everyone to take steps to prevent mosquito bites.”

WNV has been detected in mosquitoes, animals, and humans throughout the state, but the eastern half of the state is seeing high levels of WNV activity.

To prevent mosquito bites and mosquito breeding, and to protect yourself and your loved ones:

Drain standing water – Mosquitoes lay eggs in shallow, standing water. Prevent mosquitoes from laying eggs

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