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CD69 upregulation on T cells as an in vitro marker for delayed‐type drug hypersensitivity

Background:  T cells play a key role in delayed‐type drug hypersensitivity reactions. Their reactivity can be assessed by their proliferation in response to the drug in the lymphocyte transformation test (LTT). However, the LTT imposes limitations in terms of practicability, and an alternative method that is easier to implement than the LTT would be desirable.