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. 2022 Apr 11;50(6):1475–1481. doi: 10.1007/s15010-022-01817-8

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Fig. 1 — Anti-spike protein receptor-binding domain (RBD) IgG antibody titers at different time points relative to vaccinations and booster doses in COVID-19-naïve individuals and COVID-19 convalescents (Kruskal–Wallis test)