Abstract
Five patients with atopy who had chronic dermatophytosis (due to Trichophyton) manifested an immediate and strong trichophytin skin reaction but no delayed reaction. This phenomenon may be caused by the neutralization of injected antigen by serum antibodies during the immediate reaction. When a 2nd dose of trichophytin was injected 20 min after the 1st injection into the wheal of the immediate reaction, a strong delayed reaction was elicited, demonstrating cell-mediated immune responses in these patients.

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