West Nile virus activity has been confirmed in both Stanislaus and Merced counties in 2025, prompting increased mosquito control efforts and public health advisories.
In Stanislaus County, the Turlock Mosquito Abatement District reported the first detection of the virus in mosquito samples on June 17. As of late September, at least two human cases have been confirmed, according to county health officials. No fatalities have been reported.
The early detection triggered expanded mosquito surveillance and control measures, including larvicide applications, adult mosquito spraying and increased testing of mosquito pools for arboviruses…