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.
It turned out to be the surface antigen, or immune-response trigger, for hepatitis b-a principal killer among the world's diseases, and a chief precursor of liver cancer.
这就是乙肝表面抗原，也就是免疫反应的触发物质。乙肝是世界疾病谱中的头号杀手，肝癌的首要病因。
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The inventive compositions can comprise a combination of the hepatitis B antigen and other coadministered antigens.