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. 2022 Jul 20;2(3):193–199. doi: 10.1097/ID9.0000000000000057

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Copyright © 2022 The Chinese Medical Association, published by Wolters Kluwer Health, Inc.

This is an open access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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The kinetics of SARS-CoV-2 NP antigen concentration in sera collected from three COVID-19 patients on 7 to 31 days after illness onset, and the corresponding results of SARS-CoV-2 NP specific IgM and IgG antibodies in those sera. DAI: Day after illness onset; NP: Nucleocapsid.