title: Ragweed pollen challenges in a controlled environment.
mesh_terms: D000293:Adolescent; D000485:Allergens / Q000008:administration & dosage; D001249:Asthma / Q000175:diagnosis; D002648:Child; D004780:Environment, Controlled; D004890:Erythema / Q000209:etiology; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000175:diagnosis*; D007428:Intradermal Tests; D011058:Pollen; D006255:Rhinitis, Allergic, Seasonal / Q000175:diagnosis / Q000209:etiology; D012882:Skin Tests
chemical_list: D000485:Allergens