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

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© The Author(s) 2022

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Fig. 2 — Antibody avidity index of COVID-19-naïve subjects after vaccination and after 6 months of follow-up, and of COVID-19 convalescents after booster vaccination and after 6 months of follow-up (Kruskal–Wallis test). Data from avidity testing of sera from convalescents prior to vaccination gave low signals overall and avidity indices could not be determined (*)