The bronchiolar lavage fluid (BALF) will be drawn during the bronchoscopy site and approximately up to 10 ml of the bronchiolar lavage (BAL) fluid will be placed in 7 storage vials (approximately 1.5 ml per vial), frozen using liquid nitrogen as the freezing agent, and shipped on dry ice to Duke University Medical Center and/or University of Toronto. Frozen samples will be stored at -80 °C to -85 °C until shipping, and the time between collection and freezing will be recorded.