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. 2021 Jun 15;12:3633. doi: 10.1038/s41467-021-23883-6

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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 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. 2 — A Number of SARS-CoV-2-positive samples by time. B qPCR-CT values as a function of sampling date and sample source. The number of samples in the population screening bins is 45, 8, 32, 53, 11, and 8 ordered by date. The number of samples in the targeted screening bins is 34, 72, 202, 440, 454, 248, 53, and 5 ordered by date. C Fraction of SARS-CoV-2 reads mapping to reference as a function of sampling date and sample source. The center values in error bars and bands are means. The error bars and bands are 95% CIs.