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. 2021 Mar 10;11:5558. doi: 10.1038/s41598-021-84840-3

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Detection of SARS-CoV-2 specific antibodies in the plasma of COVID-19-recovered subjects. (a–b) The IgM and IgG antibodies against SARS-CoV-2-S1 RBD were detected in the plasma of COVID-19-recovered subjects and control subjects by ELISA. (c) The NAbs that block the interactions of SARS-CoV-2-S1 RBD and hACE2 were determined by an ELISA Test kit. (d–e) The correlation between the inhibition extent of NAbs and OD450 values of anti-S1 RBD as well as anti-S1 IgG antibodies. All the graphs in 1 were created by Prism 6.01 software (https://www.graphpad.com/).