
Cascade County logs Montana's 2026 West Nile case
Montana health officials confirm the state's first human West Nile virus case of 2026 in Cascade County, likely locally acquired after a nearby mosquito pool tested positive; officials say the case appears isolated but expect more cases as mosquito season continues. Most people infected are asymptomatic (~80%), about 20% develop symptoms, and fewer than 1% can have severe nervous-system illness; prevention guidance includes wearing protective clothing, draining standing water, using EPA-registered repellents, and avoiding dawn/dusk outdoors while surveillance continues.


