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. 2021 Jul 22;7:61. doi: 10.1038/s41522-021-00232-5

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© The Author(s) 2021, corrected publication 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Graphic representation of study design and sample collection. PT(+), throat swab samples from COVID-19 patients during the positive viral RNA test period; PT(−), throat swab samples from COVID-19 patients during the negative viral RNA test period; PF(+), fecal specimens from COVID-19 patients during the positive viral RNA test period; PF(−), fecal specimens from COVID-19 patients during the negative viral RNA test period. b Bacterial composition at the phylum level among groups. Sample size (n) for each group: HT, n = 44; PT(+), n = 52; PT(−), n = 88; HF, n = 32; PF(+), n = 50; PF(−), n = 31. HT, throat swab samples from the healthy controls; HF, fecal specimens from the healthy controls. c PCoA plot based on the unweighted UniFrac distance depicting differences in the bacterial community among groups.