甲型肝炎的诊断,有用双份血清于肝炎恢复后期作诊断或于发病极初期,在粪便中直接检测甲型肝炎病毒的方法。但实际上患者在粪便排甲型肝炎病毒时很少到医院,故甲型肝炎急性期的诊断尚有困难。作者于1978年2～3月在肝炎流行时的日本某中学用粪便作为标本。在发病初期于粪便中检出甲型肝 Hepatitis A diagnosis, the use of double serum in the late recovery of hepatitis for diagnosis or in the very early stages, the direct detection of hepatitis A virus in the feces method. However, in practice, patients rarely arrive at the hospital when excreting hepatitis A virus, so the diagnosis of acute hepatitis A is still difficult. From February to March 1978, the author used a droppings in a Japanese high school when hepatitis was endemic. Hepatitis A was detected in the stool at the early stage of onset