Abstract
Irrelevant reactions occurred in 68 of 157 patients (43%) with strong positive patch test reactions and concomitant weak positive reactions. A lower figure, 13 of 45 (29%) was found in patients with only weak positive patch test reactions (0.1 > P > 0.05). An allergen eliciting a weak positive reaction should therefore be retested when a conclusion has to be drawn about the epidermal sensitivity of a patient.
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