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(A) Correlation graph representing the change in anti-S1RBD IgG antibody concentrations in ChAdOx1-S -vaccinated participants (AzVac) across three time points; 12 weeks after the first vaccination dose (T1), 3 weeks after the second dose (T2), and 3 months after the second dose (T3). (B) corresponding distribution graph with bars representing median and interquartile range. **** p < 0.0001.
