Concerning the positivity limit of a skin test with a house dust antigen.
D000941:Antigens; D001249:Asthma / Q000276:immunology; D004391:Dust; D006801:Humans; D012882:Skin Tests; D014397:Tuberculosis, Pulmonary / Q000276:immunology; D014581:Urticaria / Q000276:immunology
D000941:Antigens; D004391:Dust