引起医院内感染的各种微生物中尤以细菌最为多见。这些细菌，有的来自患者本身的正常菌群，发生内源性感染。有的来自其他患者、医务人员、医院的各种环境，未消毒或未彻底消毒的各种医疗器械和用具等引起外源性感染。医院各临床科室在治疗和检查中经常使用止血带，而止血带的? Bacteria are the most common among the various microorganisms that cause nosocomial infections. These bacteria, some from the patient’s own normal flora, the occurrence of endogenous infections. Some people from other patients, medical staff, hospitals in various environments, not disinfected or not thoroughly disinfected a variety of medical devices and appliances caused by exogenous infections. Hospital clinical departments in the treatment and examination often use tourniquet, and tourniquet?