Electroencephalographic studies of patients having poliomyelitis with no clinical. evidence of encephalitic involvement

Serial electroencephalograms were done with 111 patients having poliomyelitis with no clinical evidence of encephalitic involvement. Using stringent criteria, 48 patients had considerable abnormality of the electroencephalogram. These findings could not be attributed to any complication and were qualitatively and quantitatively similar to those seen in encephalitis.