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. 2021 Jun 2;11:11616. doi: 10.1038/s41598-021-91220-4

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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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Cross-correlograms between local epidemics, number of patients staying at home, and household COVID-19 transmissibility. The local COVID-19 epidemic status is represented by the weekly number of newly diagnosed COVID-19 patients. The gray filled areas show the cross-correlations between two simultaneous variables with no time lag. The asterisk indicates the lag that produces the largest cross-correlation coefficient, suggesting a time delay between the two assessed variables.