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. 2021 Jul 14;8:676560. doi: 10.3389/fmed.2021.676560

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Copyright © 2021 Deng, Ye, Pan, Xie, Yang, Li and Li.

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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Serial data of N protein antigen and RT-PCR for 6 COVID-19 patients in different periods. Colorful lines represent patients, solid circles represent positive RT-PCR result, and hollow circles represent negative result.