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Immune responses against SARS-CoV-2 in the BBIBP-CorV-primed group. (A) The total circulating RBD Ig of SARS-CoV-2 (U/mL), and (B) circulating anti-RBD IgG of SARS-CoV-2 (BAU/mL). The lines represent GMTs. The dotted lines represent the cutoff titers; p < 0.01 (**).
