From the Fresno Bee
September 17, 2021
California’s first positive case of St. Louis encephalitis in 2021 has been reported and it’s in Fresno County.
The mosquito-borne illness, in rare and extreme cases, can cause inflammation of the brain, according to the Fresno County Department of Public Health.
A mosquito becomes infected and can pass it to humans when it bites a bird infected with the virus.
It is not transmitted person to person. Most people infected with SLEV don’t have symptoms, which can include fever, headache, or nausea up to two weeks after being bitten.
There were no details on the seriousness of the illness detected locally.