Sadly that reminds me how positive covid antibody test results haven't been a valid immunization attestation.

Maybe this type of bispecific antibodies could be used to neutralize the spike protein which the body produces through the vaccine. As far as I understand the targeted deltoid muscle is a cell with a long life therefore procuding and releasing spikes for a yet unkown timeframe. Given the various specific boosters I can imagine one taking neutralizing antibodies to avoid a constant immune system stimulation.