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Thimerosal--is it really irrelevant?

Dan Slodownik1, Arieh Ingber

  • 1Department of Dermatology, Hadassah university hospital, Jerusalem, Israel.

Contact Dermatitis
|December 21, 2005
PubMed
Summary
This summary is machine-generated.

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Thimerosal, a preservative, is often considered irrelevant in allergy testing. However, this study found a significant number of patients with relevant allergic contact dermatitis reactions to thimerosal, particularly mechanics.

Area of Science:

  • Dermatology
  • Allergology
  • Occupational Health

Background:

  • Thimerosal is a mercury-containing preservative used in vaccines and other products.
  • Previous studies suggested thimerosal is an uncommon cause of allergic contact dermatitis.
  • The clinical relevance of thimerosal sensitivity in patch testing remains debated.

Purpose of the Study:

  • To evaluate the relevance of thimerosal as an allergen in patients with suspected allergic contact dermatitis.
  • To assess the association between thimerosal sensitivity and occupational factors.

Main Methods:

  • Patch testing was performed on 508 patients suspected of having allergic contact dermatitis.
  • Standard and case-relevant allergen series were used.
  • Thimerosal reactions were scored for clinical relevance, and a significance-prevalence index number (SPIN) was calculated.

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Main Results:

  • 19 patients (3.7%) showed an allergic reaction to thimerosal.
  • A high proportion of these reactions were classified as definite (31.5%) or probable (42.1%) relevance.
  • Mechanics comprised a significantly high percentage (42.1%) of patients with positive thimerosal reactions (P < 0.0001).

Conclusions:

  • Contrary to previous reports, this study indicates that thimerosal sensitivity can be clinically relevant for a substantial number of patients.
  • Occupational exposure, particularly in mechanics, may contribute to thimerosal-related allergic contact dermatitis.
  • Further investigation into thimerosal's role in allergic contact dermatitis is warranted.