Infusion of the new marrow is carried out through a central venous catheter -in the neck veins for example- over a period of one hour or more.
After the previous procedures, the body becomes severely immunodeficient. This is “the neutropenic phase” because the transplanted bone marrow needs time to develop immunity after the destruction of the old one. During this period, the patient undergoes isolation to protect them from catching any infection, and antibiotics and antifungals are given even without an identifiable infection. After about 4 weeks, symptoms of immunodeficiency subside, and the patient is put under observation until discharge.