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1984年.在新西兰的一个城镇中,10岁儿童有70％感染乙型肝炎病毒（HBV）,约1800名13岁以下的易感儿童隔月接种了3剂2μg血源性乙型肝炎疫苗。初免后未检测抗-HBs水平。本文作者对其中178名当时为2～3岁的儿童进行了研究。将这些儿童分为两组,第1组125人,9年内未接受过跟踪调查;第2组53
In 1984, 70% of 10-year-old children were infected with Hepatitis B virus (HBV) in a town in New Zealand and about 1,800 vulnerable children under the age of 13 were vaccinated with 2 doses of 2 μg Hepatitis B Vaccine every other month. Anti-HBs levels were not detected after initial immunization. The author of this study of 178 children aged 2 to 3 years were studied. The children were divided into two groups, Group 1 125, did not follow-up survey within 9 years; Group 2 53