近年来,在欧美等发达国家,甲型肝炎病例已很少见。在高发地区(如非洲、亚洲和南美洲等地),甲型肝炎常在婴幼儿中传播,表现为无症状或轻微感染,而在发达国家,感染的对象主要为青年,其中70～80%出现严重黄疸。发达国家的高危人群是到发展中国家的旅游者或药物成瘾者,此外,还有儿科工作者、日托中心、医学实验室/厨房以及污物处理工作人员。 In recent years, in developed countries such as Europe and the United States, hepatitis A cases have been rare. In high incidence areas (such as Africa, Asia and South America, etc.), hepatitis A is often transmitted in infants and young children, showing asymptomatic or mild infection, while in developed countries, the main target of infection is young people, of which 70 to 80% Serious jaundice. High-risk populations in developed countries are tourists or drug addicts to developing countries, in addition to pediatric workers, day care centers, medical laboratories / kitchens and sewage treatment workers.