title: Histamine control affects the weal produced by the adjacent diluent control in skin prick tests.
authors: H K
authors: HK
authors: Watson
authors: R I
authors: RI
authors: Harris
mesh_terms: D004311:Double-Blind Method; D006801:Humans; D006967:Hypersensitivity / Q000175:diagnosis*; D007428:Intradermal Tests / Q000379:methods*; D015588:Observer Variation; D012882:Skin Tests / Q000379:methods*