
The aim was to correlate the magnitude of the antibody response to vaccination with previous clinical conditions and AEFI. The study recruited 1867 individuals. All vaccines enhanced anti-S1 and anti-S2 IgG antibodies over time. The highest increase after the first and second dose was observed in mRNA-1273. There was an effect of previous SARS-CoV-2 infection; and interaction of age with last SARS-CoV-2 disorder, Gam-COVID-Vac and ChAdOx1-S. The magnitude of seroconversion is predicted by age, vaccine type and SARS-CoV-2 exposure. AEs are correlated with age, sex, and vaccine type. The delta of the antibody response only correlates with AEs in patients exposed to SARS-CoV-2.
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