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. 2021 Sep 24;11:19009. doi: 10.1038/s41598-021-98396-9

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© The Author(s) 2021

Open AccessThis 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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Plots of the time series of the counts endpoint for ‘coronavirus’ or ‘#coronavirus’ or ‘covid’ or ‘#covid’ for five UK cities as well as death numbers between February and August 2020. Also plotted is the former shifted by the time lag that maximised the correlation coefficient. The dates of the formal and informal outbreaks are plotted as red and green vertical lines, respectively.