Fig. 1

Median anti-SARS-CoV-2 IgG-reactive antibodies titers measured in binding antibody units/mL (BAU/mL) at 3–6 weeks after the 2nd dose according to pre-vaccination SARS-CoV-2 infection. Patients with SARS-CoV-2 infection prior to vaccination (n = 109) had a median of 2550 BAU/mL (range 0–10,400) vs those without prior history of SARS-CoV-2 infection (n = 1118) median 493.6 BAU/mL (range 0–6338.6) (p < 0.0001)