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. 2020 Dec 1;10(1):28. doi: 10.1186/s13362-020-00096-y

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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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Age-specific contact mixing pattern estimated for each escalation phase. Shown are the heatmaps of contact matrices for all settings (workplace, school, community, and household) combined. The intensity of the color of an entry corresponds to the magnitude of the contact rate between the intersecting age classes. The row of the matrix represents the contactor age class and the column represents the age class of the contactee. Heatmaps depicted for contact mixing in (A) phase 0, (B) phase 1, (C) phase 2 and (D) the end of phase 3 on May 16