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Updated: Feb 9, 2026

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Tandem repeated irritation test (TRIT) studies and clinical relevance: Post 2006
Rasika Reddy1, Howard Maibach2
1Dermatology Service Veterans Affairs Medical Center , San Francisco , CA , USA.
Abstract:
Background/Aims: Single or multiple applications of irritants can lead to occupational contact dermatitis, and most commonly irritant contact dermatitis (ICD). Tandem irritation, the sequential application of two irritants to a target skin area, has been studied using the Tandem Repeated Irritation Test (TRIT) to provide a more accurate representation of skin irritation. Objective: Here we present an update to Kartono's review on tandem irritation studies since 2006. Methods: We surveyed the literature available on PubMed, Embase, Google Scholar, and the UCSF Dermatology library databases since 2006. Results and discussion: The studies included discuss the tandem effects of common chemical irritants, organic solvents, occlusion as well as clinical relevance - and enlarge our ability to discern whether multiple chemical exposures are more or less likely to enhance irritation.
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