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Immunization schedule and S-specific IgG responses. (A) Schedule presenting mice immunizations, bleeds, and FluoroSpot assay. (B) SARS-CoV-2 S-specific IgG responses after the second and third injections. (C) Stratified ratios of IgG2a (Th1) vs. IgG1 (Th2) subclasses.
