Figure 1.

Antibody kinetics in the first year following infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A bead-based multiplex Luminex assay was used to measure antibodies of multiple isotypes (immunoglobulins G, M, and A) to multiple antigens in serum samples from individuals with polymerase chain reaction–confirmed SARS-CoV-2 infection and prepandemic negative controls. Abbreviations: IgA, immunoglobulin A; IgG, immunoglobulin G; IgM, immunoglobulin M; RAU, relative antibody unit; RBD, receptor-binding domain.