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. 2019 Aug 15;9:11917. doi: 10.1038/s41598-019-48436-2

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© The Author(s) 2019

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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Monthly distribution of cluster 1 and cluster 2 related strains. Strains belonging to cluster 1 (green line) and cluster 2 (red line) are defined by >88% similarity by PFGE during the outbreak period. Strains unrelated to the two main clusters are not included in the chart. Most of the isolates in cluster 1 were found during screening September and October 2012, concurrent with the decline of positive isolates related to strains in cluster 1, cluster 2 related strains were introduced in November 2012.