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异常定植(abnormal colonization)是指在宿主粘膜、皮肤等体表部位致病菌、条件致病菌的异常定位和增殖,或称“群集”。异常定植与医院内细菌性感染关系密切,一般先有定植、后有感染,感染是在定植的基础上发生的。在宿主各部位的细菌定植中,以肠道和口咽部定植最为重要,医院内获得性细菌如肠杆菌科、假单胞菌科和不动杆菌属的细菌首先在肠道和/或口咽部定植和/或感染,然后才在其它部位,包括呼吸道、泌尿道和伤口等定植和感染。所以控制异常定植,尤其是肠道和口咽部异常定值的发生发展,
Abnormal colonization refers to the abnormal localization and proliferation of pathogenic bacteria and opportunistic pathogens in the surface of the body’s mucous membranes and skin, or “clusters.” Abnormal colonization and bacterial infections in the hospital are closely related, the general first colonization, after infection, infection occurs on the basis of colonization. Colonization in the intestine and oropharynx is most important in bacterial colonization of various parts of the host and bacteria in the hospital-acquired bacteria such as Enterobacteriaceae, Pseudomonas and Acinetobacter first colonize the gut and / or mouth Pharyngeal colonization and / or infection before colonization and infection at other sites, including the respiratory tract, urinary tract, and wounds. Therefore, the control of abnormal colonization, especially the development of abnormal values of the gut and oropharynx,