Levels of serum IgG to SARS-CoV-2 spike protein RBD among fully vaccinated COVID-19-naive heart and lung transplant recipients. Serum IgG binding to RBD, as measured by ELISA, at 8 days (A) or 30 days (B) after full vaccination, displayed by transplanted organ type. Data for the transplant recipients who had prior COVID-19 infection are excluded. Boxes, 25th, 50th, and 75th percentile; whiskers, smallest and largest values in dataset up to 1.5x interquartile range. All data points are shown. *, p < 0.05; **, p < 0.01; ****, p < 0.0001.
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