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. 2019 Sep 13;20:210. doi: 10.1186/s12931-019-1181-0

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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. 1 — NPA results of the COPD cases. a: Patients with acute exacerbation of COPD and stable COPD with or without microorganisms detected in the NPA. b: Percentages of individual microorganism found in NPA in the subjects. ADV = adenovirus; B. Pertussis = Bordetella pertussis; CoV=Coronavirus; Flu A = influenza A; Flu B = influenza B; HBoV = Human Bocavirus; HMPV = Human metapneumovirus; HPIV=Human parainfluenza virus; M pneumoniae = Mycoplasma pneumoniae; HRVs = Human rhinovirus; RSV = Respiratory syncytial virus