An evaluation of delayed hypersensitivity in guinea pigs to various trichophytin preparations.

Guinea pigs immunized with mycelium from Trichophyton mentagrophytes in Freund's complete adjuvant were tested intradermally with the following trichophytin preparations: TrI extracted by ethylene glycol, TrII extracted by phenol and TrII, a commercially obtained preparation fromSächsisches Serumverk KG. In our experience, TrI was found to be superior to the other preparations. It showed signifiicant delayed skin reactions in all sensitized animals and none in the controls. Lymphocyte stimulation test with this preparation (TrI) gave positive results.