“…The mean age at diagnosis is 25 years, 4,11 but this disease is being reported more frequently in the pediatric population. 6,12,17 The origin of KFD is unclear. An infectious or au toimmune hypothesis has been suggested, based on the clinical manifestations (especially the viral-like prodrome and atypical lymphocytosis) and certain histopathologi cal features such as T cells, as revealed by immunologi cal marker studies.…”