Do allergies to various types of fungi trigger worsening of asthma? Are patients with severe asthma sensitive to certain species of fungus more than others? Dr. John Heffner, professor of medicine at the Oregon Health and Science University, discusses how patients with asthma might benefit from antifungal agents. Does off-label use of itraconazole for patients with severe asthma require long-term adherence for optimal asthma control? Dr. Maurice Pickard hosts.