An 8-year-old girl is brought into the physician's office in mild respiratory distress. She has a history of allergies to cats and wool, and her parents state that she has recurrent episodes of upper respiratory tract infections. Physical examination shows expiratory wheezes, use of accessory respiratory muscles and a hyperresonant chest to percussion. Analysis of aerial blood gases discloses respiratory alkalosis and theperipheral eosinophil count is increased. What is the appropriate diagnosis?