Overview

• Wisconsin Department of Health Services confirmed the first human West Nile virus case of 2025 in Barron County.
• Hays County Health Department reported its inaugural seasonal human infection while withholding patient details for privacy.
• Dallas County Health and Human Services recorded a man in his early 40s with non-neuroinvasive West Nile disease alongside 98 positive mosquito pools detected since May.
• Toronto Public Health and the Public Health Agency of Canada verified the first domestically acquired human West Nile virus case of 2025 in an adult with no travel history.
• Health authorities across all jurisdictions are urging use of EPA-registered repellents, protective clothing and standing-water elimination as they ramp up vector control and public advisories.