[entropy_]

They would die of blood loss before that happens

[jstanley]

No they wouldn't. The blood (including antibodies) that is removed has been removed.

The question is equivalent to "if you give blood, doesn't that mean you have less blood for yourself?" and the answer is "yes, for a little while".

[jonplackett]

I don't mean all at once! I mean if they went back and gave antibodies multiple times. Does the body keep replicating antibodies too? There seems to be some concern if we'll actually be immune as it is.