Collection of Lung Fluid and Tissue Samples for Research

* HEALTHY VOLUNTEER INCLUSION CRITERIA FOR BRONCHOSCOPY AND BRONCHOSCOPIC PROCEDURES: 1. 18 to 75 years of age inclusive 2. Enrolled without regard to gender, race, or ethnicity 3. NIH staff are eligible 4. Able to provide proof of identity to the satisfaction of the study clinician completing the enrollment process 5. Able and willing to complete the informed consent process 6. Able and willing to arrange to have another person drive them home after the procedure 7. Able and willing not to eat or drink anything for 6 hours prior and 2 hours after the procedure 8. Willing to donate blood and respiratory tract samples for storage to be used for future research 9. In good general health without clinically significant medical history 10. Physical examination without clinically significant findings 11. Screening laboratory tests without clinically significant abnormalities: * Complete blood count with differential * Serum chemistries including creatinine, blood urea nitrogen, glucose, liver enzymes and function tests, electrolytes * HIV test and hepatitis serologies (HBsAg; HCV) if status is unknown * Prothrombin time, partial thromboplastin time * Urinalysis * Female subjects must have negative urine pregnancy test within 1 week of participation and continue birth control practices prior to participation * Chest radiograph (CXR) (if the subject has not had a CXR or computerized tomography \[CT\] scan of the chest within the prior 7 days) * Pulse oximetry * Electrocardiogram (ECG) * Treadmill exercise stress test (as indicated for history of angina or abnormalities on ECG) HEALTHY VOLUNTEER EXCLUSION CRITERIA FOR BRONCHOSCOPY AND BRONCHOSCOPIC PROCEDURES: 1. \<18 or \>75 years old 2. A smoking history of 10 pack-years or more, a current smoker, or tobacco free for less than a year. 3. Positive HIV status. Subjects must have a negative FDA-approved HIV blood test. \[Note: Results of HIV enzyme-linked immunosorbent assay (ELISA) will be documented, but a negative HIV polymerase chain reaction (PCR) test result will be sufficient for eligibility screening of subjects with positive HIV ELISA that is due to prior participation in an HIV vaccine study\] 4. Acute or chronic hepatitis based on viral hepatitis serologies 5. Pregnancy or breastfeeding 6. Any active medical problems especially bleeding disorders, significant bruising or bleeding difficulties with intramuscular (IM) injections or blood draws, use of anticoagulants, or pulmonary disorders including asthma 7. History of allergic reaction to lidocaine, sedative medications like Valium(TM) or Versed(TM), or narcotic medications like morphine or fentanyl 8. Immunosuppressive medications, cytotoxic medications, inhaled corticosteroids, or long-acting beta-agonists within the past three months. (Note that use of corticosteroid nasal spray for allergic rhinitis, topical corticosteroids for an acute uncomplicated dermatitis, or short-acting beta-agonists in controlled asthmatics is not excluded). 9. Use of platelet inhibitors including aspirin and nonsteroidal anti-inflammatory drugs (NSAIDs) within 7 days of procedure 10. Any medical, psychiatric, social condition, occupational reason or other responsibility that, in the judgment of the investigator, is a contraindication to protocol participation or impairs a volunteer s ability to give informed consent PATIENT INCLUSION CRITERIA FOR BRONCHOSCOPY AND BRONCHOSCOPIC PROCEDURES 1. 18 to 75 years of age inclusive 2. Known or suspected respiratory infections or infection susceptibility 3. Enrolled without regard to gender, race, or ethnicity 4. Must be enrolled in a concurrent NIH protocol and under the care of a primary physician outside of the NIH 5. Able and willing to complete informed consent process 6. Able and willing to arrange to have another person drive them home after the procedure 7. Able and willing not to eat or drink anything for 6 hours prior and 2 hours after the procedure 8. Willing to donate blood and respiratory tract samples for storage to be used for future research PATIENT EXCLUSION CRITERIA FOR BRONCHOSCOPY AND BRONCHOSCOPIC PROCEDURES 1. \<18 or \>75 years old 2. History of recent/acute clinically significant pulmonary compromise. This will be defined by the following criteria: * New lung infection or change in status of chronic lung infection or significant new findings on chest x-ray or CT scan * Asthma that is unstable or required emergent care, urgent care, hospitalization, or intubation during the past two years, or that required the use of oral or parenteral corticosteroids during the past two years * Clinically significant reactive airway disease that does not respond to bronchodilators * Unstable chronic lung disease such as Chronic Obstructive Pulmonary Disease (COPD) or pulmonary fibrosis * History of pulmonary hypertension * Requirement of supplemental oxygen at rest 3. Unstable angina or uncontrolled heart failure or rhythm disturbance 4. Significant kidney or liver disease 5. Significant anemia with a hemoglobin of less than 7.5 grams/dl. 6. Bleeding disorder diagnosed by a doctor (e.g., factor deficiency, coagulopathy, or platelet disorder requiring special precautions), significant bruising or bleeding difficulties with IM injections or blood draws, or use of anticoagulant medications 7. Use of platelet inhibitors including aspirin and NSAIDs within 7 days of procedure or clopidogrel (Plavix(TM)) within 14 days of procedure or the inability to safely stop platelet inhibitors for 7-14 days prior to procedures 8. History of allergic reaction to lidocaine, sedative medications like Valium(TM) or Versed(TM), or narcotic medications like morphine or fentanyl 9. Pregnancy or breastfeeding 10. Any medical, psychiatric, social condition, occupational reason or other responsibility that, in the judgment of the investigator, is a contraindication to protocol participation or impairs a volunteer's ability to give informed