Ⅰ病毒性肝炎继甲型、乙型肝炎以后,建立非甲非乙型肝炎的抗原—抗体系统检查法,尤其是建立包括疫苗在内的预防对策,成为目前亟需解决的问题。由于甲型肝炎IgM—抗体检测诊断法的普及,已无必要像过去一样间隔一定时间采取双份血清测定抗体效价。关于甲型的临床表现、组织学所见已有很多报告。虽然甲型未见真正的慢性化,但肝功能检查持续异常达三个月以上者似占相当多数。随着未感染者年龄的提高,如果中年以后的甲型肝炎增加,其临床表现也可能发生变化。故甲型肝炎疫苗在目前虽然尚非立即必需,但期望A型疫苗不久也可建立。82年清水氏在急性期患者 Ⅰ Viral hepatitis After the type A and type B hepatitis, the establishment of non-A non-B hepatitis antigen-antibody system test, especially to establish preventive measures including vaccines become the urgent problems to be solved. Due to the popularity of Hepatitis A IgM-antibody test diagnostics, it has not been necessary to take double sera to measure antibody titers at intervals as in the past. On the clinical manifestations of type A, histology has seen a lot of reports. Although type A no real chronic, but abnormal liver function tests for more than three months may seem to account for a large majority. As the age of uninfected people increases, their clinical manifestations may change if Hepatitis A increases after middle age. Therefore, although hepatitis A vaccine is not required immediately, it is expected that type A vaccine will soon be established. 82 years of water in patients with acute phase