某综合医院耐万古霉素屎肠球菌感染/定植患者临床特征及其环境污染

Clinical characteristics of patients with vancomycin-resistant Enterococcus faecium infection/colonization and related environmental contamination in a general hospital

  • 摘要: 目的 探讨耐万古霉素屎肠球菌(VR-Efm)感染/定植患者的临床特征及其周边环境污染情况,为医院感染防控提供依据。方法 回顾性分析2024年7-10月中山大学附属第五医院检出VR-Efm的9例患者的临床资料; 对患者体表及高频接触物体表面进行环境卫生学监测,评估防控措施落实情况。结果 9例患者中,尿液标本6例,腹水2例, 腹腔引流液1例。社区感染4例,社区定植4例,医院感染1例。年龄71.00(57.50,77.50)岁,住院日数为22.00(11.00,44.50)d。9株VR-Efm均对万古霉素、替考拉宁、氨苄西林、青霉素及左氧氟沙星耐药,对利奈唑胺、替加环素均敏感; 高浓度庆大霉素协同试验耐药8株。患者体表定植筛查共检出VR-Efm 10份(检出率45.45%,10/22),其中肛周拭子7份,检出率高于鼻腔和咽部(P=0.008)。环境物体表面检出VR-Efm共6份(检出率6.98%,6/86),卧床患者污染集中于床头桌及床旁座椅,可自由活动患者污染集中于厕所门把手及马桶按钮。高频接触表面(床周+卫生间)污染率高于低频接触表面(P=0.033)。手表面标本均未检出VR-Efm。结论 VR-Efm以社区源性输入为主,VanA型为优势耐药表型,肠道为主要定植部位。环境污染分布与患者活动能力密切相关,建议实施差异化消毒策略,对卧床患者加强床单元消毒,对自由活动患者加强卫生间区域消毒。

     

    Abstract: OBJECTIVE To explore the clinical characteristics of patients with vancomycin-resistant Enterococcus faecium (VR-Efm) infection/colonization and observe the related contamination of their surroundings so as to provide bases for prevention and control of health care-associated infections (HAIs). METHODS The clinical data were collected from 9 patients who were detected with VR-Efm in the Fifth Affiliated Hospital Sun Yat-sen University from Jul. 2024 to Oct. 2024. The environmental hygiene surveillance was carried for the body surfaces and highly frequent contact surfaces of the patients, and the status of implementation of the control and prevention measures was evaluated. RESULTS Among the 9 patients, urine specimens were collected from 6 cases, ascites from 2 cases, abdominal drainage fluid from 1 case. There were 4 cases of community-acquired infections, 4 cases of community-associated colonization, and 1 case of HAIs. The age was 71.00(57.50,77.50) years old, and the length of hospital stay was 22.00(11.00,44.50)days. All of the 9 VR-Efm isolates were resistant to vancomycin, teicoplanin, ampicillin, penicillin and levofloxacin, while the strains were sensitive to linezolid and teicoplanin. The synergy test showed that 8 strains were resistant to high concentration of gentamycin. A total of 10 VR-Efm isolates were detected in the body surface colonization screening (detection rate 45.45%), of which 7 were from perianal swabs. The detection rate was higher from the perianal swabs than from the nasal and pharyngeal swabs (P=0.008). Totally 6 VR-Efm isolates were detected on environmental surfaces (detection rate 6.98%, 6/86). Contamination was concentrated on bedside tables and bedside chairs of the bedridden patients, and on toilet door handles and toilet buttons of the ambulatory patients. The contamination rate of the highly frequent contact surfaces (bedside areas plus bathroom facilities) was significantly higher than that on the low-frequency contact surfaces (P=0.033). No VR-Efm was detected on hand surface specimens, but opportunistic pathogens were detected on the hands of cleaning staff. CONCLUSIONS VR-Efm is predominantly community-derived, with VanA as the dominant resistance phenotype and the intestinal tract as the main colonization site. The distribution of environmental contamination is closely associated with the patient mobility. It is recommended to implement a differentiated disinfection strategy, strengthen the bed unit disinfection for the bedridden patients and enhance the bathroom area disinfection for the ambulatory patients.

     

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