Overview
- Massachusetts confirmed its first West Nile–positive mosquito sample of 2026 from a trap collected June 16 in Clarksburg, the state public health laboratory said.
- Sacramento‑Yolo officials reported six positive mosquito samples and three West Nile–positive dead birds concentrated in Carmichael with additional activity in Tahoe Park.
- Contra Costa’s mosquito control district found the county’s first infected mosquitoes for the season in a trap near Pacheco Marsh and advised residents to report dead birds and remove standing water.
- Central Texas has recorded multiple positive mosquito pools, including one near Geneva Park in Williamson County, and Montgomery County confirmed a neuroinvasive human case in a woman in her 50s on Friday, June 26.
- Health agencies are increasing trapping, testing and targeted treatments while urging source reduction, EPA‑registered repellents, protective clothing at dawn and dusk, and prompt medical care for severe symptoms because most infections are mild or asymptomatic but a small share can cause serious neurological illness.