West Nile virus detected in Cascade County
The Cascade Weed and Mosquito Division detected its first West Nile virus positive mosquito sample for the year.
A positive sample of adult Culex tarsalis mosquitos was collected 2.5 miles southwest of Vaughn on July 22.
The Montana Department of Public Health and Human Services lab confirmed the positive sample on July 25.
Treatment was conducted in the area where the WNV sample was collected and surveillance and monitoring will continue, according to the county.
West Nile detected in Cascade County [2023]
There have been no known human infection of West Nile virus detected in Cascade County, but residents are encouraged to take steps to protect themselves.
The single best defense against the virus is bite prevention and the Cascade City-County Health Department recommends using the five D’s:
- 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 mosquitos are most active, avoid outdoor activities during these times
- drain standing water: standing water is the perfect breeding ground for mosquitos so drain areas around your house, such as gutters, pools, tires, buckets, water bowls, etc.
- dress appropriately with long-sleeved shirts, pants and socks
The severity and symptoms of West Nile virus can vary widely.
About 80 percent of persons infected experience no symptoms, but up to 20 percent of infected persons can develop a mild illness called West Nile fever.
The fever generally resolves itself without treatment, but dangerous brain infections such as encephalitis or meningitis can develop in one out of 150 people.
Symptoms usually appear three to 14 days after exposure and may include headache, rash, high fever, stiff neck, mental confusion, muscle weakness, tremors, convulsions, coma and paralysis. Individuals who develop any of these symptoms should see their healthcare provider immediately.
