化学治疗、免疫抑制剂以及骨髓移植虽然使血液系统的恶性肿瘤及其他血液病得到较好的治疗,但常使患者免疫力低落,易致感染,甚至死亡。使患者免疫力低落的情况如:1.白细胞极度减少或杀菌功能降低:例如急粒白血病、药物引起的粒细胞缺乏、皮质类固醇应用、酸中毒、烧伤。2.体液免疫反应降低:例如淋巴 Chemotherapy, immunosuppressive agents and bone marrow transplantation, although the hematological malignancies and other blood diseases get better treatment, but often make the patient immune compromised, prone to cause infection, or even death. To make patients with low immunity such as: 1. Extreme reduction of leukocytes or reduced bactericidal functions: such as acute leukemia, drug-induced neutropenia, corticosteroid use, acidosis, burns. 2. Reduction of humoral immune response: eg lymph