Another 848 randomly selected children born in 1997 were investigated at their homes. The results showed that in village survey, HB immunization coverage rate was 91.63%, but the qualified rate was 84.96%.

• 随机入户调查了 848名 1997年出生的儿童 ,结果表明 :乙肝疫苗接种率为 91 6 3%25 ,合格接种率为 84 96%25 ;