在接种疫苗三个星期后提取的血样表明，不管他们是注射了一半还是正常剂量的疫苗，那些年龄在18岁到49岁的人的免疫系统都被刺激到了相似的水平。

Blood samples given three weeks after vaccination showed that the immune systems in those ages 18 to 49 were stimulated at similar levels whether they got a half or full dose.

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一个剂量约莫是九岁和九岁以下孩子们的有效剂量的一半，福奇说，可是第二剂量会光鲜较着地增强他们的免疫力。

One dose was about half as effective in kids nine and younger, Fauci said, but the second dose will boost their immunity substantially.

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