院内感染是目前现代医学界全球性突出问题，是患者入院后久治不愈的重要因素，也是导致院内病死率增加的重要原因之一。院内感染的多数病原对常用抗生素不敏感或耐药。这就造成疫情不易控制及治疗困难。国外学者利用随机扩增多态ＤＮＡ指纹（ＲＡＰＤ）技术对细菌流行病学及分 Infection in the hospital is a prominent global problem in the modern medical profession at present, which is one of the important reasons for long-term treatment of patients after hospitalization and an important reason for the increase of hospital mortality. Most of the pathogen infection in the hospital is not sensitive or resistant to commonly used antibiotics. This makes the epidemic difficult to control and cure. Foreign scholars using random amplified polymorphic DNA fingerprinting (RAPD) technology on bacterial epidemiology and points