目的：分析嗜麦芽窄食单胞菌对临床常用抗菌药物的耐药性，探讨明确嗜麦芽窄食单胞菌Ⅰ、Ⅱ、Ⅲ类整合子的存在情况以及所携带的耐药基因盒，为本地区更好地预防和控制嗜麦芽窄食单胞菌感染性疾病提供帮助。方法收集临床分离的51株嗜麦芽窄食单胞菌采用微量肉汤稀释法测定嗜麦芽窄食单胞菌对17种抗菌药物的最低抑菌浓度（MIC）。根据 GenBank 注册的基因序列设计引物，PCR 扩增Ⅰ、Ⅱ、Ⅲ类整合子。对整合子阳性菌株扩增其可变区产物进行测序分析，所得结果在 GenBank数据库中进行同源性比对，了解可变区中含有基因盒的信息。结果（1）51株嗜麦芽窄食单胞菌标本来源分布以痰液最多，为41株，占80．39％，感染人群主要以60岁以上年龄段为主，为38株，占74．5％。病房分布：重症监护室（ICU）20株，占39．22％；呼吸内科13株，占25．49％；干部病房6株，占11．76％，所占比例较大。（2）药敏结果显示嗜麦芽窄食单胞菌对多数常用抗菌药物耐药性较高，部分菌株表现出对9种以上抗菌药物的多重耐药。（3）51株嗜麦芽窄食单胞菌 PCR 基因扩增结果7株菌Ⅰ类整合子阳性（13．7％），没有检测到Ⅱ、Ⅲ类整合子，Ⅰ类整合子可变区携带的耐药基因包括 aacA4、aadA1、catB8、dfrA17和 aphA15五种。结论嗜麦芽窄食单胞菌对多数常用抗菌药物耐药性较高，部分菌株表现出多重耐药性。Ⅰ类整合子是嗜麦芽窄食单胞菌多重耐药的重要因素之一。%Objective To analyze the resistance of Stenotrophomonas maltophilia to commonly used antibacterial drugs,and to investigate the existence status of 3 kinds of integron(Ⅰ,Ⅱand Ⅲ)and the carrying drug resistance gene cassettes so as to offer help for better preventing and controlling the infectious diseases caused by stenotrophomonas maltophilia in local place.Methods 51 strains of Stenotrophomonas maltophilia from clinical samples were collected and the minimum inhibitory concentration(MIC)of 17 kinds of antibacterial drugs to stenotrophomonas maltophilia was measured by the broth microdilution antifungal susceptibility test(Mi-AFST).3 kinds of integron(Ⅰ,Ⅱand Ⅲ)were amplified by PCR with primers designed according to registrated DNA se-quence in GenBank.The variable region products in the positive integron strains were amplified and performed the sequencing analy-sis.The homological comparison in the Genebank database was performed on the sequencing results for finding out what gene was included in variable domain of those integrons.Results (1)Among 51 strains of stenotrophomonas maltophilia,41 srains (80.39%) were collected from sputum samples,and the infected crowd was dominated by individuals aged over 60 years,38 strains accounted for 74.5%.In the department distribution,20 strains(39.22%)were collected from ICU,13 strains (25.49%)from the respiratory department and 6 strains(11 .76%)from the veteran cardres wards,which accounted for the larger proportion.(2)The drug suscep-tibility test demonstrated that stenotrophomonas maltophilia strains had the higher resistance to most of commonly used antibacteri-al drugs,some strains even showed the multi-drug resistance to over 9 kinds of antibacterial drugs.(3)The PCR gene amplification results showed that 7 strains (13.7%)were positive integronⅠ,while no strains containing integron Ⅱ or ⅢI were detected;the resistance genes carried in the variable region of integron I included the 5 kinds of aacA4,aadA1,catB8,dfrA17 and aphA15.Conclu-sion Stenotrophomonas maltophilias has relatively high resistance to majority of commonly used antibacterial drugs in clinic,and some strains show the muti-drug resitance.IntegronⅠis one of important factors for the multi-drug resistance of Stenotrophomonas maltophilias.
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