东阿县大李乡王庄1999年8月至11月发生一起甲型肝炎爆发流行,共发病30例,发病率为6.69%,其中自然暴露18例,占发病总数的60%,体检和粪检发现12例占40%,发病年龄最小的1岁,最大的20岁,9岁以下占93.3%,男女之比为1∶1,30例病人分布在18户,占总数户数的18.9%,其中一户一例3人 Wangzhuang, Dongli County, Wangzhuang County, August 1999 to November occurred with a pandemic of hepatitis A outbreak in 30 cases with a prevalence of 6.69%, of which 18 were naturally exposed, accounting for 60% of the total number of cases. Physical examination and excrement Detection found that 12 cases accounted for 40%, the youngest age of 1 year old, the largest 20 years of age, 93.3% under 9 years of age, the ratio of male to female 1: 1, 30 patients distributed in 18 households, accounting for 18.9% of the total number of households, , One of them a case of three people