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1995年美国允许使用甲型肝炎(甲肝)疫苗。1996年免疫实施咨询委员会(ACIP)建议,在甲肝发病率最高的人群中为≥24月龄的儿童接种。1999年扩大了接种范围,要求11个州将甲肝疫苗纳入常规免疫中,这11个州1987~1997年甲肝年平均发病率20/10万,是全国甲肝发病率的2倍,而甲肝发病率10
The United States in 1995 allowed the use of hepatitis A (hepatitis A) vaccine. The Immunization Implementation Advisory Committee (ACIP) 1996 recommended that children ≥ 24 months of age be vaccinated among those with the highest incidence of hepatitis A. Hepatitis A vaccine was routinely immunized in 11 states by expanding the range of inoculations in 1999. The average incidence of hepatitis A in these 11 states was 20 / 100,000 in 1987-1997, twice the incidence of hepatitis A in the 11 states. The incidence of hepatitis A 10