With Montana's mosquito season in full swing, West Nile virus (WNV) activity has intensified across the state. In addition to previously confirmed positive mosquito pools in Lewis and Clark County (three detections) and Cascade County (one detection), new positive tests have emerged in Hill County. Those developments elevate ongoing public health concerns and reinforce the urgency of prevention efforts.
• Cascade County: One mosquito pool tested positive earlier this season.
• Hill County: On August 15, 2025, the Hill County Health Department announced that a pool of mosquitoes tested positive...
