Fig. 7

Vaccination is conducive to decreasing CR Abs IgG levels in the sera of COVID-19 patients. IgG against (A) RBD, (B) nucleocapsid, N and (C) ACE2 proteins in sera from different groups were measured by ELISA. (D) Anti-ACE2 IgG levels in sera of unvaccinated COVID-19 patients and vaccinated COVID-19 patients after BSA or RBD preadsorption. Multiple comparisons in COVID-19 samples were conducted by two-way ANOVA. The comparison between BSA and RBD preadsorption was analyzed by paired Student’s t-test; P values were displayed, and for values less than 0.0001, they were represented as ****