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Hybrid immunity results in sustained antibody responses after the second Sinovac-CoronaVac dose. Longitudinal serum anti-nucleocapsid IgG, anti-spike-RBD IgG and %RBD-ACE2 inhibitory antibodies among naïve and infected individuals before and after two doses of inactivated COVID-19 vaccination. Each patient is represented by a colored line. Bold black line depicts the trend. Splines were plotted using the Fit Spline program in GraphPad Prism software.
