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Brasch, J. et al.

Brasch, Uter, Dibo, Stockfleth, Swensson, Christophers,

Positive patch tests with a dermatophagoides mix relate to an increased responsiveness to standard patch test allergens.

The diagnostic meaningfulness of patch tests with house dust mite allergens is still questionable. Our own impression has been that positive results with a dermatophagoides mix may occur preferentially in patients with a generally enhanced responsiveness to contact allergens. To check this, all of our patients allocated to patch testing with the standard series were additionally patch tested with a dermatophagoides mix by the same technique that was used for standard contact allergens. Out of 571 patients tested, 188 showed delayed responses to this mix that were indistinguishable from typical allergic patch test reactions but of no apparent clinical relevance. No relationship was found between positive dermatophagoides patch tests and an atopic disposition of the patients or characteristics of their eczema. However, 64.4% of the patients with a positive dermatophagoides patch test showed a response to at least 1 contact allergen of the standard series, compared to only 56.4% of the patients without a positive dermatophagoides reaction (p < 0.05). The reactivity to the mite mix was not related to the responsiveness towards any particular contact allergens. We suppose that some unidentified factors may contribute to positive reactions to the dermatophagoides mix that may also favour an enhanced general responsiveness to contact allergens.[1]

References

Positive patch tests with a dermatophagoides mix relate to an increased responsiveness to standard patch test allergens. Brasch, J., Uter, W., Dibo, M., Stockfleth, E., Swensson, O., Christophers, E. Contact Derm. (2002) [Pubmed]

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