Overview

• Placer County Health and Human Services confirmed the Roseville resident died from West Nile virus, marking the county’s first fatality this season.
• California has recorded 54 confirmed human cases in 2025, including five in Placer County, and five deaths statewide.
• Officials report a higher-than-normal proportion of West Nile–positive mosquitoes locally, with ongoing detections in mosquito and dead bird samples.
• Authorities did not release the man’s identity or disclose when or where he may have been exposed.
• Dr. Rob Oldham urged prevention steps, including EPA-approved repellents such as DEET, picaridin, oil of lemon eucalyptus or IR3535, wearing protective clothing, and eliminating standing water; severe neuroinvasive illness occurs in fewer than 1% of infections.