Mechanisms in delayed hypersensitivity.
D000818:Animals; D006168:Guinea Pigs; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000276:immunology / Q000473:pathology*; D008264:Macrophages / Q000276:immunology / Q000473:pathology; D012867:Skin / Q000473:pathology; D012882:Skin Tests