儿童非痰标本分离大肠埃希菌耐药性变迁研究

Change of drug resistance of Escherichia coli strains isolated from non-sputum specimens of children

  • 摘要: 目的 了解儿童非痰标本大肠埃希菌的分布特点及耐药性,为临床合理选用抗菌药物提供参考依据。方法 收集2011年1月-2015年12月患儿非痰标本分离出的大肠埃希菌,采用Phoenix-100全自动细菌鉴定药敏系统进行鉴定并测定MIC,采用双纸片协同扩散法检测ESBLs,三维试验法检测AmpC; WHONET5.6和SPSS20.0软件对实验结果进行统计分析。结果 2011-2015年儿童非痰标本中共分离病原菌3 109株,其中大肠埃希菌421株,占病原菌总数13.54%,占肠杆菌科细菌52.09%; 对头孢噻肟、美洛西林、磺胺甲噁唑/甲氧苄啶、氨苄西林、哌拉西林、四环素等常用抗菌药物耐药率较高,均>50.0%; 仅对美罗培南、亚胺培南、哌拉西林/他唑巴坦等耐药率<10.0%; 对头孢唑林、头孢曲松、头孢噻肟、庆大霉素、氨苄西林、哌拉西林、头孢克洛、美洛西林、头孢吡肟、妥布霉素、哌拉西林/他唑巴坦等抗菌药物的耐药率上升明显(P<0.05); ESBLs与AmpC酶检出率逐年上升(P<0.05)。结论 患儿非痰标本分离的大肠埃希菌的ESBLs与AmpC酶检出率和耐药性逐年上升,临床应监测其耐药性变化,合理选择抗菌药物,减缓抗菌药物耐药性快速上升。

     

    Abstract: OBJECTIVE To understand the distribution and drug resistance of Escherichia coli strains isolated from non-sputum specimens of children so as to provide guidance for reasonable clinical use of antibiotics. METHODS From Jan 2011 to Dec 2015, the E.coli strains were isolated from the non-sputum specimens of the children, then the strains were identified by using Phoenix-100 automatic bacterial identification and drug susceptibility system, the MIC was determined, the ESBLs were detected by means of double-disc synergy diffusion method, the AmpC was detected by using three-dimensional test method, and the test results were statistically analyzed with the use of WHONET5.6 software and SPSS20.0 software. RESULTS Totally 3 109 strains of pathogens were isolated from the non-sputum specimens that were obtained from the children in 2011-2015, of which 13.54% (421 strains) were E.coli; the E.coli strains accounted for 52.09% among the Enterobacteriaceae.The E.coli strains were highly resistant to cefotaxime, mezlocillin, sulfamethoxazole-trimethoprim, ampicillin, piperacillin, and tetracycline, with the drug resistance rate more than 50.0%; the drug resistance rates to meropenem, imipenem, and piperacillin-tazobactam were less than 10.0%.The drug resistance rates to cefazolin, ceftriaxone, cefotaxime, gentamicin, ampicillin, piperacillin, cefaclor, mezlocillin, cefepime, tobramycin, and piperacillin-tazobactam were remarkably increased (P<0.05).The detection rates of ESBLs and AmpC were increased year by year (P<0.05). CONCLUSION The detection rates of ESBLs and AmpC as well as the drug resistance rate of the E.coli strains isolated from the non-sputum specimens of the children are increased year by year.It is necessary for the hospital to monitor the change of drug resistance and reasonably use antibiotics so as to curb the rapid increase of the drug resistance.

     

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