Background: * Human respiratory syncytial virus (RSV) is a virus that causes respiratory tract infections, and is frequently responsible for hospital visits in infants and children. It can also trigger severe breathing problems for individuals who have asthma, but these infections are generally better tolerated in non-asthmatics. Some research suggests that lack of an efficient immune system response in people with asthma may make it difficult for the body to fight the effects of RSV. * Transforming Growth Factor-beta (TGF-\[beta\]) is a chemical in the body that is more prevalent in the lungs of people with asthma and related respiratory disorders. More information is needed about the effects of TGF-\[beta\] and whether it makes individuals with asthma more prone to developing RSV. Researchers hope to use this information to determine possible treatments and therapies for individuals with asthma who contract RSV. Objectives: \- To determine the possible role of TGF-\[beta\] in increased asthmatic susceptibility to RSV infection. Eligibility: \- Individuals between 18 and 60 years of age who are either healthy nonsmokers or mild asthmatics. Design: * This study involves a screening visit and a study visit. * Participants will be screened with a medical history and physical examination, as well as blood samples and a pulmonary function test. * At the study visit, participants will receive mild anesthetic and have a bronchoscopy, in which researchers insert a bronchoscope through the participant s nose or mouth and into the lungs to examine the lungs and collect lung cells. * Participants will be contacted by a research team member 24 36 hours after the bronchoscopy to ask about any side effects from the procedure.
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The primary hypothesis for Aim 1 is that asthmatics: cultured epithelia will have higher TGF-Beta expression levels than non-asthmatics.
Timeframe: analysis