Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/124237
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Type: Journal article
Title: Long-term azithromycin reduces Haemophilus influenzae and increases antibiotic resistance in severe asthma
Author: Taylor, S.
Leong, L.
Mobegi, F.
Choo, J.
Wesselingh, S.
Yang, I.
Upham, J.
Reynolds, P.
Hodge, S.
James, A.
Jenkins, C.
Peters, M.
Baraket, M.
Marks, G.
Gibson, P.
Rogers, G.
Simpson, J.
Citation: American Journal of Respiratory and Critical Care Medicine, 2019; 200(3):309-317
Publisher: American Thoracic Society
Issue Date: 2019
ISSN: 1073-449X
1535-4970
Statement of
Responsibility: 
Steven L. Taylor, Lex E.X. Leong, Fredrick M. Mobegi, Jocelyn M. Choo, Steve Wesselingh, Ian A. Yang, John W. Upham, Paul N. Reynolds, Sandra Hodge, Alan L. James, Christine Jenkins, Matthew J. Peters, Melissa Baraket, Guy B. Marks, Peter G. Gibson, Geraint B. Rogers, and Jodie L. Simpson
Abstract: Rationale: The macrolide antibiotic azithromycin reduces exacerbations in adults with persistent symptomatic asthma. However, owing to the pleotropic properties of macrolides, unintended bacteriological consequences such as augmented pathogen colonization or dissemination of antibiotic-resistant organisms can occur, calling into question the long-term safety of azithromycin maintenance therapy. Objectives: To assess the effects of azithromycin on the airway microbiota, pathogen abundance, and carriage of antibiotic resistance genes. Methods: 16S rRNA sequencing and quantitative PCR were performed to assess the effect of azithromycin on sputum microbiology from participants of the AMAZES (Asthma and Macrolides: The Azithromycin Efficacy and Safety) trial: a 48-week, double-blind, placebo-controlled trial of thrice-weekly 500 mg oral azithromycin in adults with persistent uncontrolled asthma. Pooled-template shotgun metagenomic sequencing, quantitative PCR, and isolate whole-genome sequencing were performed to assess antibiotic resistance. Measurements and Main Results: Paired sputum samples were available from 61 patients (n = 34 placebo, n = 27 azithromycin). Azithromycin did not affect bacterial load (P = 0.37) but did significantly decrease Faith's phylogenetic diversity (P = 0.026) and Haemophilus influenzae load (P < 0.0001). Azithromycin did not significantly affect levels of Streptococcus pneumoniae, Staphylococcus aureus, Pseudomonas aeruginosa, or Moraxella catarrhalis. Of the 89 antibiotic resistance genes detected, five macrolide resistance genes and two tetracycline resistance genes were increased significantly. Conclusions: In patients with persistent uncontrolled asthma, azithromycin reduced airway H. influenzae load compared with placebo but did not change total bacterial load. Macrolide resistance increased, reflecting previous studies. These results highlight the need for studies assessing the efficacy of nonantibiotic macrolides as a long-term therapy for patients with persistent uncontrolled asthma.
Keywords: Asthma; macrolides; Haemophilus influenzae; antibiotic resistance
Rights: © 2019 by the American Thoracic Society
RMID: 0030134018
DOI: 10.1164/rccm.201809-1739OC
Grant ID: http://purl.org/au-research/grants/nhmrc/569246
Appears in Collections:Medicine publications

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