The very limited usefulness of skin testing with penicilloyl‐polylysine and the minor determinant mixture in evaluating nonimmediate reactions to penicillins
2010
To cite this article: Romano A, Gaeta F, Valluzzi RL, Caruso C, Rumi G, Bousquet PJ. The very limited usefulness of skin testing with penicilloyl-
polylysineand the minor determinant mixture in evaluating nonimmediate reactions to
penicillins.
Allergy2010; 65: 1104–1107. Abstract Background: The contribution of skin testing with penicilloyl-
polylysine(PPL) and the minor determinant mixture (MDM) to the diagnosis of hypersensitivity reactions to penicillins differs greatly according to the type of reaction: immediate (occurring within 1 h after the last drug administration) or nonimmediate (occurring more than 1 h after the last drug administration). Objective: To assess the contribution of skin testing with PPL and MDM to the diagnosis of nonimmediate reactions to penicillins. Methods: We evaluated 162 adults who had had 232 nonimmediate reactions to penicillins, mostly
aminopenicillins, and presented positive skin and/or
patch teststo one or more penicillin reagents: PPL, MDM,
benzylpenicillin, ampicillin, and
amoxicillin, as well as any responsible penicillins. Results: A total of 157 subjects (96.9%) displayed
patch-testand/or delayed-reading intradermal-test positivity to penicillin reagents, which indicates a cell-mediated hypersensitivity; six of them also presented immediate-reading skin-test positivities. All 157 patients with a cell-mediated hypersensitivity were positive to the responsible penicillins (parent drugs); 16 of them also displayed delayed-reading intradermal-test positivity to MDM. Five (3.1%) of the 162 patients displayed only immediate-reading skin-test positivity (four to PPL and one to
amoxicillin). Overall, 158 subjects (97.5%) presented positive responses to the responsible penicillins, while only 9 (5.5%) and 17 (10.5%) were positive to PPL and MDM, respectively. Conclusions: The contribution of skin testing with PPL and MDM in diagnosing nonimmediate hypersensitivity reactions to penicillins, especially cell-mediated ones, is very limited. This finding could be useful at a time when PPL and MDM are not available in all countries.
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