检验医学 ›› 2013, Vol. 28 ›› Issue (5): 357-361.DOI: 10.3969/j.issn.1673-8640.2013.05.003

• 临床应用研究.论著 • 上一篇    下一篇

65株临床分离MRSA的SCCmec基因分型及耐药性研究

王爱玲1,纪冰1,孙万菊2,孟玮1,安新业1,宿振国1,王连文1,张玉梅2   

  1. 1. 滨州医学院附属医院检验科,山东 滨州 256603;2.滨州医学院病原生物学教研室,山东 烟台 264003
  • 收稿日期:2012-05-17 修回日期:2012-09-28 出版日期:2013-05-15 发布日期:2013-05-14
  • 通讯作者: 张玉梅,联系电话:0535-6913209。
  • 作者简介:王爱玲,女,1974年生,学士,主管技师,主要从事细菌分子生物学研究。
  • 基金资助:

    山东省自然科学基金资助项目(ZR2009CL002);山东省高校科技计划项目(J09LF67)

Genotyping of staphylococcal cassette chromosome mec and antimicrobial resistance of 65 isolates of methicillin-resistant Staphylococcus aureus

  1. 1.Department of Clinical Laboratory, Affiliated Hospital of Binzhou Medical University,Shandong Binzhou 256603,China;2. Department of Pathogenic Biology, Binzhou Medical University, Shandong Yantai 264003,China
  • Received:2012-05-17 Revised:2012-09-28 Online:2013-05-15 Published:2013-05-14

摘要: 目的 了解临床分离的耐甲氧西林金黄色葡萄球菌(MRSA)的葡萄球菌盒染色体(SCCmec)基因型分布特点及耐药状况。方法 多重聚合酶链反应(PCR)对MRSA进行SCCmec基因分型;普通PCR对MRSA进行4种耐药基因扩增;应用纸片扩散法测试MRSA对19种抗菌药物的敏感性。结果 SCCmec分型显示60株受试MRSA为SCCmec Ⅲ型菌株,4株为SCCmec Ⅳa型菌株,1株未分型。65株MRSA临床株对多种抗菌药物耐药,对氯霉素耐药率(4.62%)相对较低,对利奈唑胺、奎奴普丁/达福普汀、万古霉素、替考拉宁均敏感。4种耐药基因的阳性率分别为aac(6′)/aph(2′′) 93.85%、aph(3′)Ⅲ 52.31%、tetM 92.31%、ant(4′) 9.23%。结论 临床分离的MRSA SCCmec基因型以Ⅲ型为主,且具有多重耐药的特征,对氨基糖苷类、四环素类耐药基因有较高的携带率,多重PCR可以有效地用于大批量临床分离的MRSA SCCmec分型研究。

关键词: 耐甲氧西林金黄色葡萄球菌, 耐药性, 葡萄球菌盒染色体, 聚合酶链反应

Abstract: Objective To investigate the genotype distribution characteristics of staphylococcal cassette chromosome mec(SCCmec) and antimicrobial resistance of methicillin-resistant Staphylococcus aureus(MRSA). Methods Multiplex polymerase chain reaction(PCR) was used to detect SCCmec genotype. Four antimicrobial resistant genes were amplified by traditional PCR. Antimicrobial susceptibility of 19 antibiotics was detected by disk diffusion method. Results The 60 isolates of MRSA were SCCmec Ⅲ, only 4 isolates were SCCmec Ⅳa, and 1 isolate had no genotype.  All of the 65 isolates of MRSA were sensitive to linezolid, quinupristin/dalfopristin, vancomycin and teicoplanin, and were low resistant to chloramphenicol (4.62%). The positive rates of aac(6′)/aph(2′′), aph(3′)Ⅲ, tetM and ant(4′) were 93.85%,52.31%,92.31% and 9.23%. Conclusions The main SCCmec genotype of MRSA is SCCmecⅢ. MRSA has multiple resistances to commonly used antibiotics.There are high percentages of aminoglycoside and tetracycline.The multiplex PCR can be applied into genotyping study of MRSA SCCmec effectively.

Key words: Methicillin-resistant Staphylococcus aureus, Antimicrobial resistance, Staphylococcal cassette chromosome mec, Polymerase chain reaction