FIGURE 1.
Evolution of anti-RBD antibody titer. Mean (±SEM) antibody titer on d 0, 28, and 100: 1124 (±441), 514 (±205), and 146 (±39) U/mL (P = 0.003, 0.002; Wilcoxon test). RBD, receptor-binding domain; SEM, standard error of the mean.
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