HEK293 cells were transiently cotransfected having a SARS\CoV\2?spike\encoding?and a GFP\reporter plasmid
HEK293 cells were transiently cotransfected having a SARS\CoV\2?spike\encoding?and a GFP\reporter plasmid. We provide compelling evidence that the third vaccination with BNT162b2 increases the amount of neutralizing serum antibodies against Delta and Omicron variants, albeit to a lower degree when compared to the parental Wuhan strain. Therefore, a third vaccination is definitely warranted to increase titers of protecting serum antibodies, especially in the case of the Omicron variant. We also found that most clinically approved and normally potent restorative antibodies against the Delta variant failed to recognize and neutralize the Omicron variant. In contrast, some antibodies under preclinical development potentially neutralized the Omicron variant. Our studies also support using a circulation cytometry\centered antibody binding assay to rapidly monitor therapeutic candidates and serum titers against growing SARS\CoV\2 variants. Keywords: boost immunization, coronavirus,…