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甲型肝炎的临床与流行病学甲型肝炎(HA)是由甲型肝炎病毒(HAV)所引起的一种急性传染性疾病。该病病程呈自限性而无慢性感染或其他续发病症现象。该病在其主要感染对象儿童中多为轻型,且常呈隐性感染,而在大年龄患者中该病病变较重且持续时间长,可达数周至数月不等。从流行病学的观点看,根据暴露于HAV 的年龄不同,可将 HA 分为3种类型。但是必须指出,这3种类型间存在着某些中间类型,且随着某一地区生活条件的改变,HAY 的感染流行类型也随之变化。
Hepatitis A: Clinical and Epidemic Hepatitis A (HA) is an acute infectious disease caused by the Hepatitis A virus (HAV). The course of the disease was self-limiting and no chronic infection or other symptoms of renewal. The disease is predominantly mild and often invisible in children whose primary infection is contraindicated, whereas in older patients the disease becomes severe and lasts for periods ranging from weeks to months. From an epidemiological point of view, HA can be divided into 3 types depending on the age at which HAV is exposed. However, it must be pointed out that there are some intermediate types among the three types and that the prevalence of HAY varies with the change of living conditions in a particular area.