“…Interestingly, 4 years before onset of KFD, he had had an episode of drug-induced hypersensitivity syndrome (DIHS), which is a life-threatening multiorgan reaction induced by a limited number of drugs (including anticonvulsants, such as carbamazepine, phenytoin, and allopurinol [3,4,5,6,7]). DIHS is associated with reactivations of various herpesviruses [3,4,5,6,7] and has many short- and long-term sequelae and complications [8,9,10,11,12]. In this patient, EBV reactivation was observed during the course of DIHS and again at the onset of KFD, suggesting the pathogenic role of EBV.…”