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. 2016 Mar 4;6:22592. doi: 10.1038/srep22592

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The coordinates of reported locations available on 668 genotyped strains of epidemic lineage detected from November 2012 to end of May 2014 were mapped using the ArcGIS 10.1 ArcMap software (http://www.esri.com/software/arcgis/arcgis10/; ESRI, CA, USA). Each variant is colour-coded as shown in the figure legend. Shaded areas represent the distribution of dengue cases in a density gradient as indicated in the legend. Case density was calculated using the Kernel Density Tool in ArcGIS 10.1 ArcMap software (ESRI, CA, USA). Density values were classified into four classes, namely below 25^th (low in lightest tone), 26^th–50^th, 51^st–75^th and more than 75^th (high in darkest tone) quantiles, using the quantile classification method. n = number of cases per variant used in the analysis.