Figure 1

Anti-S-RBD (U/mL) levels after administration of one or two doses (21 days follow-up). mRNA-1273 (green), BNT162b2 (red) or ChAdOx1 (black/blue) vaccines among individuals with previous COVID-19 infection (Pos) or not (Neg) (ChAdOx1/ChAdOx1 (AZ): black; ChAdOx1/BNT162b2 (Pf): blue) (**p < 0.01; ***p < 0.001).