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Comparison of total anti‐RBD IgG and RBD‐ACE2‐blocking antibodies between wild‐type RBD and mutants E484K, L452R/E484Q, and N440K. (A) Total anti‐RBD IgG titers of sera obtained from COVID‐19‐convalescent donors. (B) Inhibition of RBD‐ACE2 binding by 1:20 dilution of the same samples; (C) Total anti‐RBD IgG titers of for sera obtained from donors immunized with two doses of BNT162b2 mRNA COVID‐19 vaccine (Pfizer); (D) Inhibition of RBD‐ACE2 binding by 1:20 dilution of the same samples
