Antibodies is only a part of our immune system. Th
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T-cell recognition is a mych more important thing; works for at least 17 years with the close relative: SARS-COV-1. That bodes well for SARS-COV-2 as well, look at Sweden (and New York).
So, no need to panic; immunity exists of course (as with all disseases before).
To boost the immune system: vitamin D is important, in particular for darker skinned people.
gf