乙型肝炎表面抗原(下称HB_sAg)及其特性的发现,使乙型肝炎的性质和流行病学等更为清楚。嗣后又发现甲型肝炎病人粪便中有病毒样颗粒,称为甲型肝炎抗原(下称HAAg),以后证实HAAg与甲型肝炎有关。采用此两种血清学检测方法,目前已能明确鉴别甲型或乙型肝炎。近年来的研究又发现一部分肝炎不能归因于甲型或乙型。亦不能归之于细胞巨病毒或类疱疹病毒感染。这提示至少还存在着由血清传播的第三种人类肝炎病毒。这种肝炎称为非甲、非乙型肝炎(义称丙型肝炎)。最近已陆续有非甲、非乙型肝炎的临床和流行病学研究的 The discovery of hepatitis B surface antigen (HBsAg) and its characteristics make the nature and epidemiology of hepatitis B more clear. He later found that hepatitis A virus-like particles in the stool, known as hepatitis A antigen (hereinafter referred to as HAAg), later confirmed HAAg and hepatitis A related. With these two serological tests, hepatitis A or B have now been clearly identified. In recent years, the study also found that part of hepatitis can not be attributed to A or B type. Also can not be attributed to cytomegalovirus or herpes zoster virus infection. This suggests that there is at least a third human hepatitis virus that is transmitted by serum. This type of hepatitis is called non-A, non-B hepatitis (also known as Hepatitis C). Recently there have been non-A, non-B hepatitis clinical and epidemiological studies