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Distribution of AI values detected in the convalescent plasma units transfused in this study. The red bar indicates the cutoff for a positive assay result (AI = 1.4), and the black bar indicates the cutoff for an arbitrarily high positive result (AI = 5). Abbreviation: AI, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunoglobulin G (IgG) antibody index.
