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BackgroundMethylisothiazolinone (MI) [with methylchloroisothiazolinone (MCI) in a ratio of 1:3, a well‐recognized allergenic preservative] was released as an individual preservative in the 2000s for industrial products and in 2005 for cosmetics. The high level of exposure to MI since then has provoked an epidemic of contact allergy to MI, and an increase in MI/MCI allergy. There are questions concerning...
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