La Crosse Encephalitis

Viral Diseases

Animals Involved

Chipmunks, squirrels are major amplifying hosts; rabbits, foxes, and other mammals can be infected

Known Distributions

North America

Probable Means of Spreading

Mosquito bites

Clinical Manifestations in People

Many cases mild and flu­like; meningitis or encephalitis with seizures, paralysis, and focal neurologic signs possible; most cases in children; estimated case fatality rate <1% in cases with encephalitis

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