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SARS-CoV-2 anti-Spike IgG antibody responses in participants who were baseline seronegative/RT-PCR-negative at baseline participants. Panel A: participants 18– to 64 years, Panel B: participants ≥ 65 years. Abbreviations: ELISA, enzyme-linked immunosorbent assay; EU/mL, ELISA units per mL; IgG, immunoglobulin; RT-PCR, reverse transcriptase polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
