Journal of Breath Research Quantitative analysis of volatile metabolites released in vitro by bacteria of the genus Stenotrophomonas for identification of breath biomarkers of respiratory infection in cystic fibrosis. Violetta Shestivska 1 , Kseniya Dryahina 1 , Jaroslav Nunvář 2 , Kristýna Sovová 1 , Dana Elhottová 3 , Alexandr Nemec 4 , David Smith 5 and Patrik Španěl 1* 1 J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech Republic 2 Department of Medical Microbiology 2nd Faculty of Medicine, Charles University in Prague and Motol University Hospital, V Uvalu 84, 15006, Prague 5, Czech Republic 3 Institute of Soil Biology, Biology Centre of the Academy of Sciences of the Czech Republic, 370 05 České Budějovice, Czech Republic 4 Laboratory of Bacterial Genetics, National Institute of Public Health, Šrobárova 48, 100 42 Prague, Czech Republic 5 Institute for Science and Technology in Medicine, School of Medicine, University of Keele, Thronburrow Drive, ST4 7QB, Stoke on Trent, UK. *Correspondence to spanel@jh-inst.cas.cz J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague 8, Czech Republic. Keywords: volatile metabolites, Stenotrophomonas, cystic fibrosis, selected ion flow tube mass spectrometry (SIFT-MS), gas chromatography mass spectrometry (GC-MS) 1