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Anti-SARS-CoV-2 receptor-binding domain (RBD) IgG antibody response. Geometric mean concentrations of anti-SARS-CoV-2 RBD IgG were compared from baseline (day 0) to day 56 (28 days after the second dose). BAU, binding antibody unit; GMC, Geometric mean concentration; SD, standard deviation; SCR, seroconversion rate; NIBSC, National Institute for Biological Standards and Control; HCS, human convalescent serum.
