稍微多码几个字请你补充哈。mRNA 让人体产生了Spike Proteins, 刺激人体免疫反应，包括人体的B cell T cell 有了长期记忆。当病毒入侵时，最快做出反应的是antibody,如果没有足够antibody,记忆 b cell 反应慢一些，但是也很快。

The memory B cells produced during the primary immune response are specific to the antigen involved during the first exposure. In a secondary response, the memory B cells specific to the antigen or similar antigens will respond.When memory B cells reencounter their specific antigen, they proliferate and differentiate into plasma cells, which then respond to and clear the antigen. The memory B cells that do not differentiate into plasma cells at this point can reenter the germinal centers to undergo further class switching or somatic hypermutation for further affinity maturation.Differentiation of memory B cells into plasma cells is far faster than differentiation by naïve B cells, which allows memory B cells to produce a more efficient secondary immune response.The efficiency and accumulation of the memory B cell response is the foundation for vaccines and booster shots.