Fig. 2.

Comparison of mean index values of plasma samples from Canadian Blood Services cohort run on GenScript C-Pass ELISA (2A)^a; Wantai SARS-CoV-2 Ab ELISA (2B)^b; Elecsys Anti-SARS-CoV-2 (NP) (2C)^b; and the Elecsys Anti-SARS-CoV-2 S (RBD) (2D)^b assays.^c Error bars represent standard deviation of multiple runs for each sample. Abbreviations: NP – nucleoprotein; RBD – receptor-binding domain; S – spike. ^aBased-on values at 1, 6 and 12 freeze-thaw cycles. ^bBased on values at all 12 freeze-thaw cycles. ^cSee Table 1 for details of assays used.