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

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

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3 Answers

Anonymous 0 Comments

Whenever your lymphocytes (a type of white cell from the adaptative immune system, the one that adapts to intruders) are activated to kill a pathogen, most transform into killing machines, but a small part evolve into memory cells, which then go on to live for very long in an inactive state, waiting to be reactivated if the pathogen comes back.

This is done because reactivating a memory cell is much faster than activating a brand new lymphocyte.

To answer the secondary question, they’re stored wherever there are lymphocytes, so mostly lymph nodes and the spleen.

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