Cell-mediated immunity was studied in patients with atopic dermatitis. 113 patients were patch tested with ten contact allergens. The frequency of positive reactions to patch testing with "common contact allergens" was found to be lower in patients with "high IgE values" than in those with IgE less than or equal to 1000 U/ml. A larger number of patients with severe dermatitis reacted negatively to PPD and were more difficult to sensitize with DNCB and NDMA as compared with the patients with mild dermatitis. The results of this investigation support the findings of earlier workers that patients with atopic dermatitis show disturbances in the cell-mediated immune system and these disturbances appear to be correlated to the degree of severity of the dermatitis.
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