在医院环境中,聚集有大量因疾病、损伤、老龄、早产等抗感染能力低下的患者。随医疗的进步,免疫抑制疗法、静脉补液、人工呼吸或透析等设备的应用,亦导致患者抗感染能力的下降。医院内有利于抗药菌株的形成与扩散,并大量使用增加感染机会的 In the hospital environment, there are a large number of patients with low anti-infective capacity due to diseases, injuries, aging and premature birth. With the progress of medical treatment, immunosuppressive therapy, intravenous rehydration, artificial respiration or dialysis and other equipment applications, but also lead to the decline in patients with anti-infective ability. The hospital is conducive to the formation and spread of drug-resistant strains, and extensive use of opportunities to increase the infection