Cyclic neutropenia

A hematologic disorder caused by a mutation in the ELANE (ELA2) gene, characterized by regular 21-day cyclic fluctuations in the number of blood neutrophils, monocytes, eosinophils, lymphocytes, platelets, and reticulocytes. The recurrent severe neutropenia causes patients to experience periodic symptoms of fever, malaise, mucosal ulcers, and, rarely, life-threatening infections.