Figure 2. Longitudinal serum SARS-CoV-2 antibody titers in pediatric patients receiving convalescent plasma transfusion therapy.Antibody titers expressed as reciprocal serum dilution against SARS-CoV-2 antigens in four pediatric patients (CD4, CD15, CD17, and CD25) and corresponding convalescent plasma donors (CP; open symbols) before and after plasma transfusion. Antibody titers against (a-d) the SARS-CoV-2 receptor binding domain of the spike protein (RBP), (e-h) the full-length SARS-CoV-2 S protein (S), and (i-l) the nucleocapsid protein of SARS-CoV-2 (N). Dashed lines denote the lower limit of detection (LLOD) of the assay (1:50 serum dilution)