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Neutralizing capacity of anti-RBD antibodies induced by vaccination. Data for the samples taken on day 0 (A), day 21 (B), day 90 (C), and day 180 (D) from participants without COVID-19 prior to vaccination. Data for the samples taken on day 0 (E), 21 (F), 90 (G), and 180 (H) from participants with COVID-19 prior to vaccination. The extreme values shown in the graphs were not considered for comparisons between groups. *, P < 0.05; **, P < 0.01; ***, P < 0.001.
