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. 2021 Oct 29;523:476–482. doi: 10.1016/j.cca.2021.10.035

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Fig. 2 — Antibody response to vaccination in subjects with or without previous SARS-CoV-2 infection at 1 month after vaccination. Comparison of the antibody titers specific for SARS-CoV-2 between infection-free HCW (neg; n = 703) and HCW with previous SARS-CoV-2 infection (pos, n = 64) after receiving vaccination. Anti-S, anti-Spike RBD; AU, arbitrary units.