Fig. 1: Anti-spike protein antibodies do not bind to Syncytin-1.

Ratio of the optical density (O.D.) values of binding of the indicated antibodies versus controls. HEK WT cells were used as a control for binding to HEK-Syncytin-1 cells; BSA is a control for SARS-CoV-2 receptor-binding domain (RBD). (A) Monoclonal antibodies. Each dot represents one technical replicate. B Plasma from vaccinated individuals, as collected pre-vaccination, 21 days after the 1st dose, and 2 months after the 2nd dose. Each dot represents one plasma sample. C Plasma of SARS-CoV-2 convalescent patients collected 28 days post-recovery. Each dot represents one plasma sample. Data representative from one experiment with 3 technical replicates per sample. Depicted are means ± standard deviations; ns not significant, **p < 0.01, ***p < 0.001, ****p < 0.0001 as determined by a two-sided Student’s t test.