08/26/2026
West Nile Virus human case identified in Cascade County.
Multiple mosquito pools have tested positive for WNV around the state. Hill County mosquitos have not yet tested positive, however we strongly encourage everyone to take steps to protect themselves.
The single best defense against WNV is bite prevention. To protect yourself, use the 4 Ds:
• DEET - Apply repellent containing an EPA-registered active ingredient, such as DEET, and follow the directions on the package.
• DUSK and DAWN - This is when mosquitoes are most active. Try to avoid outdoor activities during these times.
• DRAIN STANDING WATER - Standing water is the perfect breeding ground for mosquitoes. Drain such areas around your home (gutters, pools, tires, buckets, water bowls, etc.).
• DRESS APPROPRIATELY - Wear long-sleeved shirts, long pants, and socks.
NEWS RELEASE August 25, 2026
Cascade County reports first human case of West Nile Virus
Cascade County public health officials have reported the state’s first case of West Nile Virus (WNV) in a human. The last human case reported in Cascade County was in 2018.
WNV is a virus is primarily spread to people by mosquito bites. The severity and symptoms of WNV can vary widely. Approximately 80% of persons infected experience no symptoms, but up to 20% of infected persons can develop a mild illness called West Nile fever.
Residents are strongly encouraged to take steps to protect themselves. The single best defense against WNV is bite prevention. To protect yourself, use the 5 Ds:
• DEET - Apply repellent containing an EPA-registered active ingredient, such as DEET, and follow the directions on the package.
• DUSK and DAWN - This is when mosquitoes are most active. Try to avoid outdoor activities during these times.
• DRAIN STANDING WATER - Standing water is the perfect breeding ground for mosquitoes. Drain such areas around your home (gutters, pools, tires, buckets, water bowls, etc.).
• DRESS APPROPRIATELY - Wear long-sleeved shirts, long pants, and socks.
Cascade County W**d & Mosquito Division has been conducting regular treatments for mosquito larvae and adult mosquitoes and will continue to do so in addition to ongoing surveillance and monitoring efforts.
Media inquiries should be directed to Trisha Gardner at 406-791-9261 or Joshua Blystone at 406-454-6920.