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. 2018 Aug 9;8:11907. doi: 10.1038/s41598-018-29920-7

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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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Ordination of samples based on similarity in bacterial community composition and correlation with E. coli culturing counts. (A) Ordination of bacterial communities using NMDS based on Spearman rank order correlation coefficients. Samples are coloured according to their E. coli counts measured by culturing (Colilert-18^®) except for the Bromma wastewater treatment plant sample that is coloured in black. Samples with green contours are the ten samples confirmed to be contaminated (red text) or not contaminated (blue text) by wastewater according to follow-up investigations. (B) Comparison between community composition (NMDS1) and E. coli density (E. coli culturing counts). Spearman rank order correlation coefficient (rho) and p-value are indicated.