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甲型肝炎在工业化国家甲肝已不多见,但在有的人群还是个问题,包括幼儿园、养老院、军队等。在发展中国家有广泛流行,有的地区,年龄到5～10岁以上已100％有过感染。甲肝对婴儿和儿童比较轻,也不会转变成慢性。一般感染甲肝病毒后发病的少,但有的地区可达25％,个别地区发病率高达80％。所以预防仍有必要,免疫球蛋白有短时间的预防效果,有效控制仍需接种疫苗。甲肝疫苗已有进展,灭活甲肝疫苗和减毒活疫
Hepatitis A is rare in industrialized countries, but it is still a problem in some people, including kindergartens, nursing homes and the army. In developing countries are widespread, in some areas, the age of 5 to 10 years of age have been 100% infected. Hepatitis A is mild to infants and children and does not change to chronic. Hepatitis A virus infection generally less incidence, but some areas up to 25%, the incidence in some areas up to 80%. Therefore, prevention is still necessary, immunoglobulins have a short-term preventive effect, effective control is still vaccinated. Hepatitis A vaccine has progressed to inactivate hepatitis A vaccine and live attenuated virus