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. 2021 May 18;11:10519. doi: 10.1038/s41598-021-90026-8

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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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Comparison of SARS-CoV-2 viral loads between each collection site and swab type. The set of viral loads in the same participant is represented by connected lines. The viral loads were compared by the Wilcoxon signed-rank test, and p values are corrected with Holm correction. NP-type swab nasopharyngeal-type swab, OP-type swab oropharyngeal-type swab, CI confidence interval, IQR interquartile range.