念珠菌是人体常见的条件致病菌。在正常情况下属人体常见共生菌。当机体抵抗力降低时,如患全身性感染、慢性疾病、肿瘤或长期大量使用抗菌素、皮质类固醇激素、细胞毒和免疫抑制剂以及放疗时,体内的念珠菌可转为致病性,引起内源性感染。“外源性”的因素如进行静脉导管、体外循环、器官移植、放置导尿管、气管插管等手术操作,也可为外源性真菌的入侵创造条件。我 Candida is a common human pathogen. Under normal circumstances is a common human symbiotic bacteria. When the body’s resistance to reduce, such as systemic infection, chronic diseases, cancer or long-term heavy use of antibiotics, corticosteroids, cytotoxic and immunosuppressive agents and radiotherapy, Candida in vivo can be converted to pathogenic, causing Source infection. “Exogenous” factors such as intravenous catheter, cardiopulmonary bypass, organ transplantation, catheterization, endotracheal intubation and other surgical operations, but also for the invasion of exogenous fungi create the conditions. I