病毒性肝炎是危害我国人民健康的重大传染病。常用的病原学分类有甲、乙、丙、丁和戊型病毒性肝炎并沿用至今,但还有1 0 %～2 0 %病毒性肝炎患者尚不能分型,暂时被称为非甲非戊型病毒性肝炎[1 ] 。本文就病原学研究中的一些基本观点及进展归纳如下。1　甲型肝炎病毒(hepatitisA Viral hepatitis is a major infectious disease that endangers the health of our people. Commonly used etiological classification of hepatitis A, B, C, D and hepatitis E viral hepatitis and still in use, but there are 10% ~ 20% of patients with viral hepatitis can not type, temporarily referred to as non-methyl non-E Viral hepatitis [1]. This article on the etiology of some of the basic ideas and progress are summarized below. Hepatitis A virus (hepatitisA