FIGURE 2.

Increased avidity of BNT162b2‐induced antibodies compared to antibodies induced by infection. (A, B) Average recognition of RBD_wt by convalescent (A) or vaccine‐induced sera (B) by avidity ELISA. Samples washed with PBS‐Tween (black) and 7 M urea (red). (C) Avidity indexes are shown for recognition of mutant RBDs by vaccine‐induced sera. These indexes are calculated by dividing the area under the curve (AUC) of urea washed samples by AUC of PBS‐Tween washed samples. Note that recognition of mutant RBDs by convalescent sera was too low to calculate a meaningful avidity index