散发性脑炎,在高原地区(海拔2300—3,200米)并非罕见。我院1975年～1981年6月收治散发性脑炎71例,临床观察具有如下特点。一、呈急性或亚急性发病。78.9％有前驱症状,其中,上呼吸道感染占63.4％,消化道症状占15.5％。以青壮年多见,11—30岁为53.1％。男女罹患无明显差异。农牧区发病较城市高2倍。一年四季均可发病,6—9月发病占54.3％。 Sporadic encephalitis, in the plateau region (2300-3,200 meters above sea level) is not uncommon. 71 cases of sporadic encephalitis were admitted to our hospital from 1975 to June 1981, the clinical observation has the following characteristics. First, was acute or subacute disease. 78.9% had prodromal symptoms, of which, upper respiratory tract infection accounted for 63.4%, gastrointestinal symptoms accounted for 15.5%. More common in young adults, 53.1% aged 11-30. There was no significant difference between men and women. The incidence of rural areas and pastoral areas 2 times higher than the city. The disease can occur throughout the year, 6-September incidence of 54.3%.