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West Nile Virus confirmed in Cascade County
Health officials detected a positive mosquito sample in Cascade County, urging local residents to take precautions.

Health officials confirmed a West Nile Virus positive sample in mosquitoes near Vaughn, Montana.
West Nile Virus detected in Cascade County
GREAT FALLS — The Cascade County Weed & Mosquito Division has found the first positive case of West Nile Virus (WNV) in mosquitos for 2025. On July 22, a sample of Culex tarsalis mosquitoes, located 2.5 miles southwest of Vaughn, tested positive for the virus. The Montana Department of Public Health confirmed these findings on July 25. Treatment in the area has already begun, alongside continued surveillance efforts. To date, no human cases of WNV have been reported in Cascade County this year. Public health officials recommend residents take preventive measures against mosquito bites, as the majority of people infected experience no symptoms.
Key Takeaways
"The best defense against WNV is bite prevention."
This highlights the key message for residents to protect themselves against the virus.
"About one in five infected people will experience mild illness."
This statistic underscores the risks associated with WNV infections.
The discovery of West Nile Virus in Cascade County highlights ongoing public health challenges in managing mosquito populations. While the current absence of human cases is reassuring, the potential severity of WNV infections cannot be understated. As health officials continue their monitoring, the public's proactive engagement in bite prevention remains essential. This incident serves as a reminder for communities to stay vigilant during mosquito season and to implement preventive strategies effectively.
Highlights
- Ignoring mosquito bites is not an option this season.
- Be proactive in protecting yourself from West Nile Virus.
- Mosquito prevention can save lives this summer.
- Simple steps can keep your family safe from WNV.
Concerns about public health and safety
The detection of West Nile Virus in mosquitoes raises public health concerns, especially as it can lead to severe illness in a small fraction of infected individuals.
Residents must stay informed and take action to protect themselves from mosquito-borne diseases.
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