neutropenia is a blood condition a granulocyte disorder that characterized by a deficiency of neutrophils a type of white blood cell that defends the body against bacterial and fungal infectionsgranulocytes are a category of white blood cells they are made in bone marrowtransplant in some serious causes of neutropenia such as aplastic anemia leukemia or kostmann syndrome stem cell or bone marrow transplantation may be recommended granulocyte infusion this is a type of blood transfusion where the patient just receives granulocyte cellseutrophil production in the bone marrow is reduced this can occur if the patient has an infection such as tuberculosis vitamin b 12 deficiencies or folic acid deficiency some viral infections can cause neutropenia including epstein barr virus cytomegalovirus hiv and viral hepatitis