Among the lower age group, vertical transmission is the major transmission route.
在低年龄组人群中，母婴传播是主要的传播途径。
Because all these patients are infected by the vertical transmission when they were born.
因为所有这些患者都是出生时母婴垂直传播感染的。
Because all these patients are infected by the vertical transmission when they were born.
因为所有这些患者都是出生时母婴垂直传播感染的。
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