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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

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rRT-PCR Ct values of respiratory samples from NP antigen positive or negative COVID-19 patients (A), and the sera concentration of NP antigen in mild, moderate, severe, or critical COVID-19 patients by clinical typing (B). Statistical significance was analyzed by Mann-Whitney U test. ^∗P < 0.05, ^∗∗P < 0.01. NP: Nucleocapsid; rRT-PCR: real-time RT-PCR.