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Comparison of S-IgG antibody concentrations about seven weeks post-infection (red), five weeks after prime vaccination with AZD1222 (orange) or BNT162b2 (=two weeks after homologous booster vaccination, blue), and four weeks after heterologous booster vaccination (purple). Red dotted line = manufacturer’s positive cut-off at 33.8 BAU/mL. Abbreviations: AZ = AZD1222, BT = BNT162b2, MO = mRNA-1273. Significance levels: *** p value < 0.001, **** p value < 0.0001.
