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作者用4种乙型肝炎(HB)疫苗给婴幼儿和成人接种后,进行了为期3年的长期观察。免疫对象共525人,其中男性198人,女性
The authors conducted a three-year long-term observation of infants and children after vaccination with four hepatitis B (HB) vaccines. A total of 525 immune targets, of which 198 were male and female