How does our immune system remember the viruses or bacterias it has seen before?

Question

Are the special white cells “stored” somewhere in our body?

In: Biology

Answer 1

Yes, these B and T cells are physically floating around in various places. They hang out in the circulation, in lymph nodes, in the bone marrow (B-derived plasma cells) and many tissues. That memory will last as long as a particular lineage of cells is still alive.