Anti-SARS-CoV-2 RBD IgG response to ancestral Wuhan strain
None of the participants were seropositive for anti-RBD IgG 7 days after the first dose. All were seropositive after the second dose. Anti-SARS-CoV-2 RBD IgG geometric mean concentrations (GMCs) 2 weeks after the second dose had significantly increased (SARS-CoV-2 humoral immune responses against the ancestral Wuhan strain following accelerated regimens of fractional, ID administration. 