All 8 patients were admitted comatose or with febrile convulsions. Five patients had a history of diarrhea and/or vomiting. The patients' ages ranged from 4 months to 9 years old (median, 1.6 years). Six patients had normal neurological development, however, 2 patients had previously been diagnosed as epileptic. Four patients were admitted in winter, between December and February. Seven patients were transferred to our center within 24 hours after the onset of coma or convulsions. Three patients survived (Table 1 ).