[chana_masala]

I recall hearing that as well but I can't quite remember what the rest of the picture is - something about the other parts of the immune system being able to do the needed work? Or that it was shown that someone with zero antibodies could still be immune?

[F30]

Other parts of the immune system, specifically T-cell response. The simplified bottom line is that antibodies provide a quick response that also prevents many cases of mild disease. T-cell immunity lasts longer, appears more universal against variants and should still work relatively well against severe cases.

[tchalla]

Basically, memory B-cells remember the code for anti-bodies and they are produced "on demand". Please see the graph in the figure below.

https://askabiologist.asu.edu/memory-b-cell