Overall infection rate is low, but high among people in their 20s-the most economically productive age group.

总体感染率较低，但在20多岁这一最具经济活力年龄组别人群中的感染率较高。

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Overall infection rate is low, but high among people in their 20s-the most economically productive age group.

总体感染率较低，但在20多岁这一最具经济活力年龄组别人群中的感染率较高。

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