In order to determine the causative drug, 20 patients who were clinically diagnosed to have drug eruptions but had no evidence for causative drug by the patch test, were thus studied both with the drug lymphocyte stimulation test (DLST) and the drug-stimulated IFN-
γ production test (IFN-
γ test). The IFN-
γ test was carried out by measuring the IFN-
γ activity in the culture supernatant obtained after the incubation of peripheral lymphocytes either with or without the causative drug. The IFN-
γ test was considered to be positive when the stimulation index was over 180%. In this study, a positive IFN-
γ test was more frequently observed than a positive DLST, although no statistical difference was observed between them. These results may thus suggest that the IFN-
γ test is useful as a new
in vitro test for determining the causative drug in drug eruptions.
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