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Reactivity of human sera to RBD and S proteins.
ELISA for detection of SARS-CoV-2–specific IgG antibodies in serum samples from vaccinated people. Blue dots indicate serum reactivity to RBD and red dots indicate serum reactivity to S. The dotted line indicates ELISA cut-off value = 0.1 (mean of negative sera +3xSD) and 0.25 for IgG RBD ELISA and COVIDAR, respectively. These results represent one of two independent replicates.
