Immune Response in Hypersensitivity Pneumonitis

"Bronchoscopy will be performed according to standard clinical procedures. Bronchoscopy will be performed under conscious sedation with continuous cardiopulmonary monitoring and the subject's upper airway will be anesthetized with topical lidocaine. The bronchoscope will be passed through the naris or mouth to the upper airway and then into the lower airway. 360cc of sterile saline will be instilled into 2 sub-segments by instilling and aspirating 3 aliquots of 60cc sequentially into each sub-segment.~Venipuncture to obtain peripheral blood mononuclear cells (PBMCs) for the proposed assays.~Cells collected will be analyzed for various T-cell subsets and gene expression to help determine the type of immune response."