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. 2020 Dec 11;3:780. doi: 10.1038/s42003-020-01526-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a The positive rate of IgA, IgM, and IgG antibodies against SARS-CoV-2 nucleocapsid (N), spike (S) proteins and neutralizing antibodies (NAbs) in all the cases between 1 and 28 days after symptom onset. The fitted curve lines are created by Fit Spline program of Graphpad software where shadows indicating 95% confidence intervals. The table below the figure denotes the number of samples tested at each time point given in days and the positive rate at each day were used to draw the fitted curve. b Levels of IgM, IgA, and IgG antibodies and titers of NAbs against SARS-CoV-2 in plasma samples over course of the disease. Antibody titers were expressed as optical density (OD) value and NAbs titers are shown as geometric mean titers (GMTs). The median and quartiles were represented in the violin plots.