EBV-associated T/NK-cell lymphoproliferative diseases EBV-associatedhemophagocytic lymphohistiocytosis (EBV-HLH) Epstein-Barr virus (EBV) Medicine Paediatric medicine aggressive NK-cell leukemia (ANKL) chronic active EBV infection (CAEBV) extranodal NK/T-cell lymphoma-nasal type (ENKTL) hydroa vacciniforme-like lymphoproliferative disorder severe mosquito bite allergy systemic EBV-positive T-cell lymphoma of childhood