Swiss i-research and teaching institute 1 article published in JoVE Medicine Design and Development of a Model to Study the Effect of Supplemental Oxygen on the Cystic Fibrosis Airway Microbiome Jacob Vieira1, Tara Gallagher2, Hui-Yu Sui1, Sirus Jesudasen3, Katrine Whiteson2, George A. O'Toole4, Kurt Hanselmann5, Peggy S. Lai1 1Division of Pulmonary and Critical Care Medicine, Massachusetts General Hospital, 2Department of Molecular Biology & Biochemistry, University of California, Irvine, 3Department of Medicine, Massachusetts General Hospital, 4Department of Microbiology & Immunology, Geisel School of Medicine at Dartmouth, 5Swiss i-research and teaching institute The goal of this protocol is to develop a model system for the effect of hyperoxia on cystic fibrosis airway microbial communities. Artificial sputum medium emulates the composition of sputum, and hyperoxic culture conditions model the effects of supplemental oxygen on lung microbial communities.