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. 2019 Dec 23;19:260. doi: 10.1186/s12890-019-1021-5

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© The Author(s). 2019

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. 2 — The change of microbiota in saliva (I) and tracheal aspirate (II). Gray circle indicates the tracheal aspirate and gray triangle indicates the saliva. PC1: Principal Component 1, PC2: Principal Component 2, (A): samples collected within 2 h after intubation, (B): samples collected just before administration of antibiotics, (C): samples collected 48–72 h after the administration of antibiotics