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Antibody data by fetal sex. SARS-CoV-2 infection: A, Maternal IgG; B, transfer ratio (infant IgG:maternal IgG); C, infant IgG. Vaccination: D, Maternal IgG; E, transfer ratio; F, infant IgG by fetal sex (female vs male). All comparisons P = NS using Mann-Whitney U tests. Abbreviations: AU, arbitrary units; IgG, immunoglobulin G; NS, not significant; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
