From the Modesto Bee
September 15, 2021
The virus that causes St. Louis encephalitis was detected in a mosquito sample in Stanislaus County, health officials said Wednesday.
The St. Louis virus is a relative of the West Nile virus, which gets attention in the Central Valley every year for causing a potentially deadly neurological illness in some residents.
In a small number of cases, St. Louis encephalitis may include symptoms such as headache, confusion, dizziness, seizures, paralysis or even death. But most people who become infected will not feel sick.