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. 2022 Mar 21;22:274. doi: 10.1186/s12879-022-07274-w

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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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — COVID-19 confirmed case rate in Hong Kong as of Feb 18th, 2021. a The local confirmed case rate in wave 1&2 of the COVID-19 spread in Hong Kong (by May 2020). b The imported confirmed case rate in wave 1&2. c The local confirmed case rate in wave 3 (Jul–Oct 2020). d The local confirmed case rate in wave 4 (Nov 2020–Feb 2021). e The entropy-based land use index value, together with boundaries of the main urban area and New Towns (i.e., satellite towns). The choropleth maps are colored according to quantile classification, and “p” in the legend means the percentile range of the variable values in each class among all TPUs