A model of human asthma exacerbation identifies mechanisms that drive allergic asthma

In this study, we will enroll allergic adults to undergo bronchoscopic segmental allergen challenge, in order to identify differences in the airway immune response to allergen in those with asthma compared to those without asthma. After a discussion about the study and potential risks, subjects giving written informed consent will undergo two bronchoscopies. During the first procedure, samples will be collected from the left lung and allergen will be administered to a small segment of the right lung. The second procedure will be performed 24 hours later, with collection of samples from the allergen-challenged lung segment.