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In vivo demonstration of immunologic cross‐reactivity to octylisothiazolinone in patients primarily and strongly sensitized to methylisothiazolinone
Author(s) -
Russo Juan Pedro,
Aerts Olivier
Publication year - 2020
Publication title -
contact dermatitis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 96
eISSN - 1600-0536
pISSN - 0105-1873
DOI - 10.1111/cod.13661
Subject(s) - medicine , concomitant , patch test , sensitization , dermatology , patch testing , gastroenterology , allergy , contact dermatitis , immunology
Abstract Background Notwithstanding that concomitant exposure to different isothiazolinone derivatives may result in concomitant sensitization, clinical and animal studies have suggested cross‐reactivity between these derivatives, notably between methylisothiazolinone (MI) and octylisothiazolinone (OIT). Objective To investigate if patients sensitized to MI show cross‐reactions to OIT and/or to benzisothiazolinone (BIT) by applying the concept of the re‐test method. Patients And Methods From March to October 2019 consecutive patients were patch tested with MI 0.2% aqueous in duplicate at the two lower corners of both shoulder blades. Patients sensitized to MI, but not to OIT 0.1% petrolatum (pet.) nor to BIT 0.1% pet., were re‐tested, 2 months later, with the latter two derivatives at the skin sites where the MI reactions had fully disappeared. Results Of 116 patients, 15 (13%) were sensitized to MI, eight of these not sensitized to BIT nor to OIT. Of these, seven patients, all (very) strongly sensitized to MI, were re‐tested: five patients showed positive patch test reactions to OIT 0.1% pet.; one patient to OIT 0.1% pet. and BIT 0.1% pet.; and one other patient showed no reactions. Conclusion This study suggests that patients primarily and strongly sensitized to MI may show immunologic cross‐reactions to OIT, and to a far lesser extent to BIT.