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Detection of SARS-CoV-2-specific antibodies and S protein-specific B cells. (A) Temporal changes in IgM and IgG antibodies against SARS-CoV-2. The IgM and IgG antibodies were considered positive when their titers were greater than 10 AU/ml. Red dashed line indicates scale 10. (B) Frequency of SARS-CoV-2 S-specific B cells.
