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关于病毒性肝炎目前已知至少有甲型、乙型、非甲非乙型三种,此外已报道有第四型的可能性。近年来由于甲乙型肝炎都可用免疫学方法作出特异性珍断,因此对甲型肝炎在部队中的流行情况也有了进一步的了解。虽然从1961年以后在世界范围内没有发生大的甲型肝炎流行,乙型逐渐增多,但局部的甲型肝炎流行仍不断出现。甲型肝炎对部队的危害性一直是严重的,并且仍在持续上升没有得到控制。以美国陆军为例,近十年来病毒性肝炎发病率增加了七倍,其中甲、乙两型肝炎的发病数大致相等。例如1974年(从这年起,陆军中肝炎发病报告要求确定甲、乙型),每千名陆军中甲型肝炎平
About viral hepatitis is currently known at least A, B, non-A non-B three, in addition to the possibility of a fourth type has been reported. In recent years, hepatitis A and B have been used to make specific genotypes by immunological methods. Therefore, further understanding of the prevalence of hepatitis A in the armed forces has been made. Although no major hepatitis A epidemic occurred in the world since 1961, and B was gradually increasing, the local epidemic of Hepatitis A continued to emerge. Hepatitis A has been a devastating force on the army and continues to rise unchecked. Take the United States Army as an example. The incidence of viral hepatitis has increased seven-fold in the past decade. The incidence of hepatitis A and B hepatitis is roughly equal. For example, in 1974 (from this year onwards, the report on the incidence of hepatitis in the army required the identification of type A and B), Hepatitis A Level