Patients with any pulmonary infiltrate including those suspected to be of infectious origin; in particular, patients with resolution of clinical symptoms of pulmonary infection but with residual pulmonary infiltrates on chest x-ray are not eligible until pulmonary infiltrates have completely resolved New or progressive pulmonary infiltrates on screening chest x-ray or chest CT scan that has not been cleared by Pulmonary. Infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) No evidence of acute pulmonary infiltrates on chest radiograph New or progressive pulmonary infiltrates on screening chest X-ray or chest CT scan unless cleared for study by pulmonary; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) New or progressive pulmonary infiltrates on screening chest X-ray or chest computed tomography (CT) scan unless cleared for study by Pulmonary; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) New or progressive pulmonary infiltrates on screening chest X-ray or chest computed tomography (CT) scan unless cleared for study by pulmonary; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) New or progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan unless cleared for study by pulmonary; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) New or progressive pulmonary infiltrates; progressive pulmonary infiltrate is defined as an increase of 20% or greater from prior radiologic exam; radiologic assessment methods may be computed tomography (CT) or posterioranterior (PA)/lateral (L) x-ray imaging; infiltrates attributed to infection must be stable or improving after 1 week of appropriate therapy, or 4 weeks for presumed or proven fungal infections to be eligible New progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan that have not been evaluated with bronchoscopy; infiltrates attributed to infection must be stable/improving after 1 week of appropriate therapy (4 weeks for presumed or proven fungal infections) New or progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan unless cleared for study by pulmonary. Infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections). New or progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan that has not been evaluated with bronchoscopy; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections); surgical resection waives any waiting requirements New progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan for which evaluation with bronchoscopy is not feasible; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections) Patients with an abnormal chest X-ray and/or any pulmonary infiltrate including those suspected to be of infectious origin; in particular, patients with resolution of clinical symptoms of pulmonary infection but with residual pulmonary infiltrates on chest x-ray are not eligible until pulmonary infiltrates have completely resolved New or progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan that has not been evaluated with bronchoscopy, if feasible; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections); surgical resection waives any waiting requirements New or progressive pulmonary infiltrates on screening chest x-ray or chest computed tomography (CT) scan that has not been evaluated with bronchoscopy, if feasible; infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections)