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当很多发达国家中甲肝发病率上升时,第一种甲肝疫苗已在西欧的几个国家获准使用。据在维也纳召开的甲肝国际专题研讨会提供的数字,每年从发达国家到甲肝流行地区旅游的人有3000万,大约40～50%的甲肝
When the incidence of hepatitis A in many developed countries has risen, the first hepatitis A vaccine has been approved for use in several countries in Western Europe. According to figures provided by the Hepatitis A International Symposium held in Vienna, there are 30 million people traveling from developed countries to endemic areas of Hepatitis A each year, and about 40 to 50% of Hepatitis A