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. 2017 Oct 4;5:129. doi: 10.1186/s40168-017-0345-8

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — CFUs retrieved from 500 l air, appearing on R2A after 72 h incubation at 32 °C. a Mean CFU values (y-axis), whereas different sampling locations within one module were grouped for each sampling event (x-axis). b The mean CFU values (y-axis) of all sampling events for each sampling location (x-axis). c The CFU values (y-axis) from a representative sample location (dining area, location 4) for each sampling event (x-axis)