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. 2019 Jul 4;9:9713. doi: 10.1038/s41598-019-46085-z

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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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Bouncing of bacteria in a shallow meniscus. (A) Side view of a mucus droplet showing a wide shallow precursor film where the bacteria bounce. The height of the droplet is 100 μm. (B) Sequence of fluorescent images illustrating flagella reorganization. The bacterial body is highlighted with a green oval. Initially, the bacterium was swimming in the direction of the red arrow, then, the body stops and the flagella reorganize on the other side of the body, reversing the swimming direction. The yellow arrows point out the position of the flagellar bundles. Scale bar 10 μm.