“…Additionally, the presence of a large number of immature myeloid cells can inhibit antigen specific T cell response (8) Therefore, newly diagnosed leukemia patients often present with concurrent infections (7). Treatment with standard induction regimens results in prolonged neutropenia that can last weeks, rendering the host highly susceptible to bacterial and fungal infections (7). Furthermore, polymorphonuclear leucocyte function may be adversely affected by several chemotherapeutic medications such as high dose glucocorticoids, vincristine, vinblastine, carmustine, cyclophosphamide and 6-mercaptopurine (9).…”