COVID-19 spike antibody levels vs normal B cells. Spike antibodies by the LIPS (A) and Elecsys (B-D) assays after the third (n = 149 in panel A; n = 224 in panel B), fourth (n = 161 in panel C), and fifth (n = 76 in panel D) vaccine doses. Points including spike antibody levels of >24 999 U/mL are shown above the 24 999 level.