Increased expression of IL‐33 is found in the lower airways of patients with seasonal allergic rhinitis and is not related to natural allergen exposure. Issue 6 (21st February 2021) - Haccuria, Amaryllis; Van Muylem, Alain; Malinovschi, Andreï; Rasschaert, Joanne; Virreira, Myrna; Bruffaerts, Nicolas; Hendrickx, Marijke; Michils, Alain