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Immunological response of the SARS-CoV-2 spike-specific memory B cells before and 28 days after administration of the booster dose to the three groups. (A) Percentage in and (B) folds change spike-specific memory B cells the day before and 28 days after administration of the booster dose to three groups. (∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.005, ∗∗∗∗P < 0.001).
