Influenza and Parkinson's disease.
D000367:Age Factors; D004781:Environmental Exposure; D006801:Humans; D009980:Influenza A virus; D007251:Influenza, Human / Q000150:complications*; D010300:Parkinson Disease / Q000453:epidemiology / Q000209:etiology*; D010301:Parkinson Disease, Postencephalitic / Q000209:etiology; D014481:United States