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. 2018 Jun 14;8:9090. doi: 10.1038/s41598-018-27173-y

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© The Author(s) 2018

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Geographic distribution of rate of primary and secondary syphilis (P/S) cases (per 100,000 persons) in county level in 2014, and the smoothed trends of bi-weekly number of reported P/S syphilis cases in city level of Guangdong Province from January 2014 through June 2015 (the map was created in ArcGIS 10.3).