Summary 1. All of the eight patients with measles encephalitis showed abnormal electroencephalographic findings soon after onset of their central nervous system disease. ( A) In seven of these the electroencephalographic pattern became normal, and all of these children appear to have recovered without detectable evidence of permanent central nervous system injury. ( B) In the case of the eighth child, the central nervous system damage did not improve, the electroencephalogram remained abnormal, and death resulted. 2. Six children who were convalescent from uncomplicated measles all showed normal electroencephalograms.