Comparison of simultaneous patch testing with parthenolide and sesquiterpene lactone mix

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Abstract
Several studies have pointed out that the sesquiterpene lactone (SL) mix is a safe, though inadequate, screen for Compositae allergy. To test the usefulness of the sesquiterpene lactone parthenolide as a supplementary Compositae screening test to the mix, both were included in the standard series in 2 Danish dermatology departments. Among 2244 patients tested, 46 (2%) were positive to SL mix and 73–75% of these were positive to parthenolide. The results demonstrate that parthenolide is not suitable as a supplementary screening agent to SL mix, but may be a fairly good screen on its own if the mix is not available.