There's no lag period, and notice that antibody levels start rising right away after the second exposure.

没有迟滞期，注意抗体水平在第二次接触后立即开始上升。

youdao

There's no lag period, and notice that antibody levels start rising right away after the second exposure.

没有迟滞期，注意抗体水平在第二次接触后立即开始上升。

youdao