How do memory cells(B-cells) encounter pathogens?

This question talks about how most of the memory B cells reside in the spleen and that upon a reinfection, produce antibodies which then circulate the blood. I want to know if this process is really that efficient because if most of the B cells reside in the spleen then does it imply that only the peripheral B cells are involved in producing antibodies? Or are they somehow signalling other B cells to do the same?

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    $\begingroup$ It's plasma cells that produce the large amounts of antibodies. They come from B cells. $\endgroup$ – forest Feb 21 at 1:47

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