Allergic asthma is the most prevalent form of asthma, with 60% of adult asthma patients and 80% of school-age asthma patients having AA. It involves sensitivity to a perennial aeroallergen, or an airborne allergen that is present year-round, such as mold and fungal spores, dust mites, pet dander, and cockroach debris. This allergic sensitivity triggers asthma symptoms and attacks.