由于近年来计划免疫的广泛开展,乙型脑炎的发病率逐年降低,而其它一些病毒性脑炎的发病率逐年增加,且在部分地区呈流行趋势。我们将1998～1999年间夏秋季病毒性脑炎101例进行分析,以探讨夏秋季病毒性脑炎的流行及变异特点。1　对象与方法1.1　对象1998年及1999年7～10月份在我 Due to the widespread immunization of planned immunization in recent years, the incidence of Japanese encephalitis is decreasing year by year, while the incidence of some other viral encephalitis is increasing year by year, and is in the trend of epidemic in some areas. In 1998 and 1999, we analyzed 101 cases of viral encephalitis in summer and autumn to discuss the epidemic and variation characteristics of viral encephalitis in summer and autumn. 1 objects and methods 1.1 objects 1998 and 1999 July to October at me