Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of La Crosse encephalitis ?
    ### Response:
    What are the symptoms of La Crosse (LAC) encephalitis? Most people infected with LAC encephalitis do not have symptoms. Those that do become ill may initially have fever, headache, vomiting and lethargy (tiredness). Severe cases may develop encephalitis, an inflammation of the brain, which is often accompanied by seizures.
    