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. 2020 Oct 29;10:18629. doi: 10.1038/s41598-020-75629-x

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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 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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Histogram analyses: distribution of COVID-19 patients according to the duration (days) between the first negative and the first recurring positive NP swab test results. (A) COVID-19 patients with recurrence of PCR positivity (the case group). (B) The subset (N = 40) of the case group who had IgM and IgG antibody testing performed at the initial discharge. All case patients with the antibody tests were IgG positive. COVID-19 Coronavirus disease 2019, PCR polymerase chain reaction, NP nasopharyngeal.