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ELISA linearity for SARS-CoV-2 spike responses. Linear regression comparing O.D. 450-570 nm values to dilution of plasma for each antibody evaluated is shown. Linear model lines for each sample included for IgA, IgG1, IgG3, IgM and total IgG for both spike and RBD. Each line of best fit represents a unique sample. The adjusted multiple R2 value for each antibody class is shown.
