Economo von San Serff disease
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E·con·o·mo von San Serff dis·ease(ē-kon-ō'mō von sahn serf),
a unique encephalitis, presumably viral in origin, which followed the influenza pandemic of 1914-1918. Symptoms included ophthalmoplegia and marked somnolence, and in many survivors, the delayed development of Parkinson disease; the basis for postencephalitic Parkinsonism.