近数十年来的研究认为,存在两种不同类型的病毒性肝炎,即经注射途径传播的、长潜伏期的血清性肝炎和经粪—口途径传播的、短潜伏期的传染性肝炎。近年来发现澳大利亚抗原(Au,HAA,HBAg)与血清性肝炎相关而与传染性肝炎无关,其后又发现两型肝炎均可经注射及粪一口途径传播,两型肝炎的潜伏期有相当多的重叠。目前用甲型肝炎和乙型肝炎的名称以代替过去的传染性肝炎和血清性肝炎。 Recent decades of research have suggested that there are two different types of viral hepatitis, namely, injectable, long-latency serogroups of hepatitis, and short-term infectious hepatitis transmitted by the fecal-oral route. In recent years, it has been found that Australian antigens (Au, HAA and HBAg) are related to serum hepatitis and have nothing to do with infectious hepatitis, and subsequently found that both types of hepatitis can be transmitted by injection and fecal route. There is considerable latency overlapping. Hepatitis A and B are currently used in place of past infectious hepatitis and seronegative hepatitis.