内蒙古大兴安岭林区９０年代初被确定为森林脑炎（Ｔｉｃｋ－ｂｏｒｎｅｅｎｃｅｐｈａｌｉ－ｔｉｓ，简称森脑）自然疫源地，林区人群均存在森林脑炎病毒感染，尤以男性青壮年为高危人群〔１、２〕。为探索森脑的流行特征，发病规律及临床表现，为制定防治措施提供依据，... In the early 90s, Inner Mongolia Daxinganling forest area was identified as a natural epidemic of tick-borneencephali-tis (Senna encephalitis), and forest encephalitis virus was found in all forest areas, especially for young and middle-aged men [1 , 2]. In order to explore the epidemiological characteristics of Sennheimen, incidence and clinical manifestations, to provide a basis for the development of prevention and treatment measures, ...