The prognosis is dependent on the virulence of the virus and the patient’s health status. Extremes of age (< 1 y or >55 y), immune-compromised status, and preexisting neurologic conditions are associated with poorer outcomes. Approximately 40% of survivors have minor-to-major learning disabilities, memory impairment, neuropsychiatric abnormalities, epilepsy, fine-motor-control deficits, and dysarthria....