We studied the case records of 16 patients with eastern equine encephalitis (EEE) in Massachusetts from 1970 to 1984 and compared their presentations, courses, and outcomes with the data available from previous epidemics. In recent years, there has been a greater frequency of EEE in adults, whereas in the past it was considered a disease of children. Also, prognosis for a good functional recovery seems to be correlated with age over 40 years, a long prodromal course (5 to 7 days) of constitutional symptoms, and the absence of coma. Previous reports did not mention these significant correlations. We also stress the positive and negative diagnostic correlations, in order to distinguish between EEE and herpes simplex encephalitis.
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