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. 2021 Jun 16;12:708523. doi: 10.3389/fimmu.2021.708523

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Copyright © 2021 Xiang, Liang, Fang, Lu, Li, Wang, Li, Yang, Shen, Zhu, Wang, Wu, Liu, Lu, Yang, Dittmer, Trilling, Deng and Zheng

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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Sero-positivity of virus-specific IgG and IgM antibodies in 76 convalescent COVID-19 patients over time. The x-axis indicates the timeline following the onset of symptoms. Curves show the overall sero-positivity of IgG and IgM antibodies recognizing the RBD of the spike protein (anti-S IgG: green; anti-S IgM: purple) and the nucleoprotein (anti-N IgG: orange; anti-N IgM: blue). Numbers of samples (No.) at different time points are depicted under the diagram.