Further analysis showed that over half of those infected with hepatitis B in Taiwan acquired it in their early childhood. Among those people, half got it via "vertical transmission" from the mother at birth and the other half were directly infected by the age of two.
進一步分析，台灣的 B 肝感染半數以上在幼童時期發生，其中一半是出生時經由母親「垂直感染」，另一半則屬兩歲前的接觸感染。