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Geometric mean highest antibody titers over the entire study period and after 60 days post-onset. The geometric mean titers of RBD IgG, RBD IgM, ectodomain, N proteins, and neutralization in the mild, moderate, and severe groups at the highest titers over the entire study period (black squares) and after 60 days post-onset (gray squares) were calculated. * and **, p<0.05 and p<0.01, respectively (one-way ANOVA followed by Tukey's test).
