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SARS-CoV-2 anti-IgG pre- and post-vaccination. Antibody signals in k = 21 paired participants, who re-ceived a COVID-19 vaccine during the study, at baseline and 14 to 56 days post-vaccination, presented by individ-ual SARS-CoV-2 antigen (k = 21): (A) anti-S, (B) anti-RBD, (C) anti-N. Differences in antibody signals were examined with a paired Wilcoxon signed rank test.
