To the Editor.—
In the November 1983 Archives Tagami et al1 suggested that delayed hypersensitivity plays a crucial role in the development of drug-induced toxic epidermal necrolysis (TEN). They reported positive intradermal and epicutaneous skin test reactions as well as an abnormal result of the lymphocyte transformation test (LTT) in a woman 2½ months after TEN was induced by ampicillin