A 2004 survey found that, among children born after the start of the vaccination programme, 5.2% of those aged seven to 12 years were hepatitis b-antigen-positive.
2004年所作的一项调查发现，计划免疫活动开始以来出生的儿童中，有5.2%的7至12岁儿童呈乙肝抗原阳性反应。
A 2004 survey found that, among children born after the start of the vaccination programme, 5.2% of those aged seven to 12 years were hepatitis b-antigen-positive.
2004年所作的一项调查发现，计划免疫活动开始以来出生的儿童中，有5.2%的7至12岁儿童呈乙肝抗原阳性反应。
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