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甲型肝炎主要经粪-口途径传播。甲型肝炎病毒(HAV)感染后平均约28d引起的无症状或症状性感染与年龄密切相关。6岁以上儿童,大多数感染 (70％)表现为无症状或非特异性症状。稍大儿童或成人,感染通常有症状,70％成年患者出现黄疸。美国近30％甲型肝炎患者为15岁以下的儿童,最常见的传染方式是与甲型肝炎患者同居在一家或者性接触。但是报道病例中40％～50％患者无明确的传染源。
Hepatitis A is mainly transmitted by the fecal-oral route. Asymptomatic or symptomatic infections caused by an average of about 28 days after Hepatitis A virus (HAV) infection are closely related to age. Most children over 6 years of age (70%) show asymptomatic or nonspecific symptoms. Slightly larger children or adults, the infection is usually symptomatic, jaundice in 70% of adult patients. Nearly 30% of patients with hepatitis A in the United States are children under 15 years of age. The most common mode of transmission is cohabitation or sexual contact with hepatitis A patients. However, 40% to 50% of the reported cases did not have a clear source of infection.