Patients with COVID produced a T-cell driven immune response to between 17 & 18 different regions of the virus. Antibody immunity only measures a fraction of this response. Concerns about single letter mutations enabling evasion of immunity are misplaced. https://www.cell.com/cell-reports-medicine/fulltext/S2666-3791(21)00015-X#%20

Basing policy on antibody testing alone is foolish. Antibody positivity will not include all those who have developed immunity and deliberately excludes all those with prior immunity (because the test was designed such that pre-COVID blood samples would all test negative).

SARS-CoV-2 genetic sequence has ~30,000 letters. Alterations in a handful of letters will not change it's shape much - if it did it wouldn't function properly anyway. Fear mongering about immune escape is not needed and is irresponsible esp when no evidence to support the claims.

I will now await accusations of being right wing because I dared to mention T cells.