烟曲霉是免疫缺陷病人的重要医源性病源体,其感染率正在上升,且防治甚为困难,即使经适当治疗,也有90％以上患者死亡。在医院内或周围建筑施工时感染率升高,可出现群集性感染。由于缺乏可靠的分型系统,这种流行病学现象难以解释。究竟是因为该菌孢子数增多引起感染可能性增加,还是有一过性单个传染源引起对同一菌株的群集性感染仍不清楚。本 Aspergillus fumigatus is an important source of iatrogenic disease in immunodeficient patients. Its infection rate is on the rise and prevention and treatment are very difficult. Even after proper treatment, more than 90% of the patients died. In the construction of the hospital or around the construction of infection rates may increase cluster infection. This epidemiological phenomenon is difficult to interpret due to the lack of a reliable typing system. Is it because of the increase in the number of bacteria spores increased the possibility of infection, there is a transient single source of infection caused by the same strain of cluster infection is still not clear. this