To observe but not to perceive.
D001419:Bacteria; D003888:Desensitization, Immunologic; D005658:Fungi; D006801:Humans; D007267:Injections; D008517:Phytotherapy; D011058:Pollen / Q000008:administration & dosage / Q000302:isolation & purification; D012130:Respiratory Hypersensitivity / Q000628:therapy*