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https://hdl.handle.net/2440/102789
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Type: | Journal article |
Title: | Airway dysbiosis: Haemophilus influenza and Tropheryma in poorly controlled asthma |
Author: | Simpson, J. Daly, J. Baines, K. Yang, I. Upham, J. Reynolds, P. Hodge, S. James, A. Hugenholtz, P. Willner, D. Gibson, P. |
Citation: | European Respiratory Journal, 2016; 47(3):792-800 |
Publisher: | European Respiratory Society |
Issue Date: | 2016 |
ISSN: | 0903-1936 1399-3003 |
Statement of Responsibility: | Jodie L. Simpson, Joshua Daly, Katherine J. Baines, Ian A. Yang, John W. Upham, Paul N. Reynolds, Sandra Hodge, Alan L. James, Philip Hugenholtz, Dana Willner and Peter G. Gibson |
Abstract: | Asthma is a chronic inflammatory disorder of the airways where bacteria may act as protagonists of chronic inflammation. Little is known about the relation of airway inflammation to the presence of specific bacterial taxa. We sought to describe the sputum microbiome in adults with poorly controlled asthma. DNA was extracted from induced sputum and microbial communities were profiled using 16S rRNA pyrosequencing. Bacterial species were characterised, and the relationship between microbial populations, asthma inflammatory subtypes and other covariates was explored. Real-time PCR was used to identify Tropheryma whipplei and Haemophilus influenzae in sputum. Adults with neutrophilic asthma had reduced bacterial diversity and species richness. Tropheryma was identified and confirmed with real-time PCR in 12 (40%) participants. Haemophilus occurred most often in a group of younger atopic males with an increased proportion of neutrophils. PCR confirmed the presence of H. influenzae in 35 (76%) participants with poorly controlled asthma. There are phenotype-specific alterations to the airway microbiome in asthma. Reduced bacterial diversity combined with a high prevalence of H. influenzae was observed in neutrophilic asthma, whereas eosinophilic asthma had abundant T. whipplei. |
Keywords: | Respiratory System Neutrophils Sputum Humans Haemophilus influenzae Asthma Pulmonary Eosinophilia Inflammation RNA, Ribosomal, 16S Linear Models Adult Aged Middle Aged Female Male Tropheryma Microbiota Dysbiosis |
Rights: | Copyright ©ERS 2016 |
DOI: | 10.1183/13993003.00405-2015 |
Grant ID: | http://purl.org/au-research/grants/nhmrc/569246 |
Published version: | http://dx.doi.org/10.1183/13993003.00405-2015 |
Appears in Collections: | Aurora harvest 3 Medicine publications |
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