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甲型肝炎病毒（HAY）的感染率随年龄增大而升高；随社会经济地位上升而降低；人群中以往感染过乙型肝炎病毒（HBV）的比例越大，则HAV的感染率越高，而且远远超过HBV的感染率；HAV的感染率高低与性别和种族无关；在世界各地，它因公共
The prevalence of hepatitis A virus (HAY) increased with age; decreased with socioeconomic status; and the greater the proportion of people previously infected with hepatitis B virus (HBV), the higher the HAV infection rate , Far exceeding the rate of HBV infection; the prevalence of HAV infection is not related to gender and ethnicity; it is affected by public