It is the CD169+ Macrophage that delivers the antigen/virus to the Lymphocytes.

This Macrophage has functions that have influences on both the B and T Lymphocytes. Do not ignore that 1/3 of people have little to no Antibody response to COVID19. IMO it appears this virus is a carrier that attacks the function of both basic types of lymphocytes.

This the paper that describes it about COVID19:

https://www.medrxiv.org/content/10.1101/2020.03.27.20045427v1

This is the paper that details the functions of the CD169+ Macrophage:

https://www.ncbi.nlm.nih.gov/pmc/articles/

>>8868019

I consider COVID a bio-weapon to deliver immune-suppression but it may take months or years for symptoms of that.