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The pathogenesis of the disease and the inflammatory, infective and molecular drivers of disease progression are not fully understood, making the development of novel treatments challenging. Understanding the role bacteria play in disease progression has been enhanced by the use of next-generation sequencing techniques such as 16S rRNA sequencing. The microbiome has not been extensively studied in bronchiectasis, but existing data show lung bacterial communities dominated by<jats:italic>Pseudomonas<\/jats:italic>,<jats:italic>Haemophilus<\/jats:italic>and<jats:italic>Streptococcus<\/jats:italic>, while exhibiting intraindividual stability and large interindividual variability.<jats:italic>Pseudomonas-<\/jats:italic>and<jats:italic>Haemophilus<\/jats:italic>-dominated microbiomes have been shown to be linked to severe disease and frequent exacerbations. Studies completed to date are limited in size and do not fully represent all clinically observed disease subtypes. Further research is required to understand the microbiomes role in bronchiectasis disease progression. This review discusses recent developments and future perspectives on the lung microbiome in bronchiectasis.<\/jats:p>","DOI":"10.1183\/16000617.0048-2019","type":"journal-article","created":{"date-parts":[[2019,9,4]],"date-time":"2019-09-04T12:25:24Z","timestamp":1567599924000},"page":"190048","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":103,"title":["The microbiome in bronchiectasis"],"prefix":"10.1183","volume":"28","author":[{"given":"Hollian","family":"Richardson","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alison J.","family":"Dicker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heather","family":"Barclay","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James 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