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. 2021 Oct 8;12:753435. doi: 10.3389/fimmu.2021.753435

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Copyright © 2021 Heinzel, Pinilla, Elsner, Friessinger, Mordmüller, Kremsner, Held, Fendel and Kreidenweiss

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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SARS-CoV-2 IgG levels in plasma of adult control groups. IgG concentrations reactive to SARS-CoV-2 were estimated by commercial ELISA (EUROIMMUN). Results are shown as violin plots. Prepandemic: plasma collected 2015-2019, Negative: Individuals without (known) SARS-CoV-2 infection, Convalescent: Individuals with previous COVID-19. Solid line: Cut-off for SARS-CoV-2 IgG positivity; grey area: intermediate antibody concentration; solid red lines: median; dashed red lines: quartiles. Black dashed-line boxes highlight selected individuals for subsequent ELISAs.