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Atopy patch test reactions to Malassezia allergens differentiate subgroups of atopic dermatitis patients

C Johansson1, M H Sandström, J Bartosik

  • 1Department of Medicine, Unit of Clinical Allergy Research and Dermatology and Venereology, Karolinska Institutet and Hospital, SE-171 76 Stockholm, Sweden.

The British Journal of Dermatology
|March 26, 2003
PubMed
Abstract

Insights

Malassezia yeast contributes to atopic dermatitis (AD). Testing revealed significant Malassezia allergen reactivity in AD patients, particularly with the atopy patch test (APT), highlighting its role in eczema.

Area of Science:

  • Dermatology
  • Immunology
  • Microbiology

Background:

  • Malassezia yeast is implicated as a contributing factor in atopic dermatitis (AD).
  • Understanding Malassezia's role in AD pathogenesis is crucial for effective management.

Purpose of the Study:

  • To assess reactivity to Malassezia allergens in adult patients with atopic dermatitis.
  • To compare reactivity using specific serum IgE, skin prick tests, and atopy patch tests (APT).

Main Methods:

  • Investigated 132 adult AD patients, 14 seborrheic dermatitis patients, and 33 controls.
  • Tested reactions to Malassezia sympodialis extract and recombinant allergens (rMal s 1, rMal s 5, rMal s 6).
  • Measured specific serum IgE, skin prick tests, and APT.

Main Results:

  • 67% of AD patients showed positive reactions to Malassezia allergens across tests.
  • Positive APT reactions were found in 41% of AD patients with head and neck dermatitis.
  • APT identified Malassezia hypersensitivity in subgroups of AD patients, including those without head/neck dermatitis.

Conclusions:

  • Malassezia plays a role in eliciting and maintaining eczema in atopic dermatitis patients.
  • Atopy patch testing (APT) reveals significant Malassezia hypersensitivity in specific AD patient subgroups.
  • Integrating APT enhances the diagnostic approach for Malassezia-related AD.

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