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. 2020 Oct 29;10:18680. doi: 10.1038/s41598-020-75771-6

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© The Author(s) 2020

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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Occurrence status of the two clusters in Hokkaido, spatial distribution of population, and the total number of WSSCI per half grid (WSSCIphg) in Hokkaido. (a) Timeline of outbreaks of two clusters in Hokkaido, Cluster I: Kitami cluster and Cluster II: Sapporo cluster, based on the Hokkaido government’s official announcement. The existence of the Kitami cluster and Sapporo cluster was admitted on March 9 and March 18, 2020, respectively. (b) Population distribution in Hokkaido. The color scale ranges from red (large) to yellow (small) and white (zero). The blue marker denotes the location of a cluster (Kitami cluster is [43.804878, 143.897225] and Sapporo cluster is [43.068700, 141.350767]). (c) Spatial distribution of the total number of WSSCIphg throughout every 400 half grid squares between January 27 and March 1, 2020. The colors of grid squares represent the total WSSCIphg throughout every 400 half grid squares, of which red is large, blue is small, and white is zero. The blue marker denotes the location of a cluster (Kitami cluster is [43.804878, 143.897225] and Sapporo cluster is [43.068700, 141.350767]).