Chronic active Epstein-Barr virus infection: a novel cause of lymphocytic variant hypereosinophilic syndrome

To the editor: Lymphocytic variant hypereosinophilic syndrome (LHES) is a rare disease in which cytokine production by T cells drives blood and tissue eosinophilia.[1][1],[2][2] We report a case of LHES in a patient with chronic active Epstein-Barr virus (CAEBV) infection and an EBV-infected T-cell