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Multicenter Patch Testing With Methylchloroisothizoline/Methylisothiazolinone in 100 and 200 ppm Within the
Malin Engfeldt1, Iris Ale, Klaus E Andersen
1From the *Department of Occupational and Environmental Dermatology, Skåne University Hospital, Lund University, Malmö, Sweden; †Allergy Center and Department of Dermatology, University Hospital, Republic University of Uruguay, Montevideo; ‡Department of Dermatology and Allergy Centre, Odense University Hospital, University of Southern Denmark; §Department of Dermatology, University Hospital Jena, Germany; ∥Department of Dermatology, National Skin Center, Singapore, Singapore; ¶Contact Allergy Unit, Department of Dermatology, University Hospital K.U. Leuven, Belgium; #MGM Medical College, Mumbai, India; and **Department of Dermatology, Fujita Health University School of Medicine, Toyoake, Japan.
Background:
The preservative methylchloroisothiazolinone/methylisothiazolinone (MCI/MI) is a well-known contact sensitizer. Historically, there have been different opinions on the optimal patch test concentration of MCI/MI, and both 0.01% and 0.02% aqueous (aq.) have been proposed. In 2011, based on literature reviews, it was recommended that the concentration of 0.02% aq. should be used in the international baseline series.
Objectives:
The aim of this study was to verify the recommendation from 2011 by comparing the patch test results from consecutive patch testing with MCI/MI 0.01% and 0.02% in clinics representing countries around the world.
Patients And Methods:
Two thousand seven hundred three consecutive patients with dermatitis in 8 dermatology clinics representing 8 countries were patch tested with MCI/MI 0.01% aq. and, in parallel with MCI/MI 0.02% aq., provisionally included in the baseline series.
Results:
Contact allergy to MCI/MI at 0.01% and 0.02% was found in 3.7% and 5.6% of the patients, respectively (P < 0.001).
Conclusions:
Methylchloroisothiazolinone/MI 0.02% aq. (dose, 6 μg/cm) diagnoses significantly more contact allergy than 0.01% (dose, 3 μg/cm), without resulting in more adverse reactions. Methylchloroisothiazolinone/MI at 0.02% aq. should therefore be continuously used in the international baseline series.