检验医学 ›› 2012, Vol. 27 ›› Issue (6): 475-478.

• 微生物学检验论著 • 上一篇    下一篇

不同来源耐甲氧西林金黄色葡萄球菌毒力基因的研究

  

  1. 衢州市人民医院,浙江 衢州 324000
  • 收稿日期:2012-03-16 修回日期:2012-04-15 出版日期:2012-06-30 发布日期:2012-06-06
  • 作者简介:祝 进,男,1969年生,学士,副主任技师,主要从事临床微生物学实验诊断工作。

Research on virulence gene of multi-source methicillin-resistant Staphylococcus aureus

Quzhou People′s Hospital,Zhejiang Quzhou 324000,China   

  1. Quzhou People′s Hospital,Zhejiang Quzhou 324000,China
  • Received:2012-03-16 Revised:2012-04-15 Online:2012-06-30 Published:2012-06-06

摘要: 目的 对临床分离的耐甲氧西林金黄色葡萄球菌(MRSA)感染状况进行分析,并通过对MRSA菌株、甲氧西林敏感金黄色葡萄球菌(MSSA)菌株毒力基因的检测,分析比较不同金黄色葡萄球菌(SA)的毒力基因分布。方法 收集衢州市人民医院2009年1月至2011年6月临床标本分离的MRSA菌株60株,MSSA菌株54株。采用聚合酶链反应(PCR)检测不同标本分离的SA的杀白细胞素(pvl)、肠毒素C(sec)、肠毒素H(seh)、α-溶血素(hla)、β-溶血素(hlb)、黏附素凝聚因子(clfA 、clfB)、纤连蛋白结合蛋白(fnbA、fnbB)毒力基因。结果 60株MRSA菌株主要分布在神经外科、普外科、小儿科、骨科等病区,其中17株为社区获得性MRSA(CA-MRSA),43株为医院获得性MRSA(HA-MRSA)。MRSA菌株中pvl的检出率明显高于MSSA菌株,而clfA、fnbA、sec、she的检出率明显低于MSSA。而pvl、fnbA在CA-MRSA中的检出率要高于HA-MRSA。结论 临床分离的SA中,MSSA菌株毒力相对MRSA可能更高,而CA-MRSA相对HA-MRSA毒力也较强,他们之间携带毒力基因的差别可能与之侵袭的感染部位相关。

关键词: 耐甲氧西林金黄色葡萄球菌, 甲氧西林敏感金黄色葡萄球菌, 社区获得性, 医院获得性, 毒力基因

Abstract: Objective To investigate the infection status of clinical methicillin-resistant Staphylococcus aureus(MRSA),and analyze the distribution of Staphylococcus aureus(SA) virulence gene in clinical detection of MRSA and methicillin-sensitive Staphylococcus aureus(MSSA).  Methods A total of 60 clinical MRSA isolates and 54 clinical MSSA isolates were collected from January 2009 to June 2011 in Quzhou People′s Hospital. Polymerase chain reaction(PCR) was used to detect virulence gene panton-valentine leukocidin(pvl),staphylococcal enterotoxin C(sec),staphylococcal enterotoxin H(seh),hemolysin A (Hla),hemolysin B(Hlb),clumping factor A(clfA),clumping factor B(clfB),fibronection-binding protein A(fnb A) and fibronection-binding protein protein B(fnbB)of these clinical SA isolates.  Results A majority of 60 MRSA isolates distributed in Neurosurgery,General Surgery, Paediatrics and Orthopaedics Departments. The 17 isolates of 60 MRSA were considered as community-associated MRSA(CA-MRSA), and 43 isolates of 60 MRSA were hospital-associated MRSA(HA-MRSA). In contrast to MSSA, the positive detection rate of pvl in MRSA was higher, but the positive detection rates of clfA,fnbA,sec and seh were lower. The positive rates of pvl and fnbA in CA-MRSA were higher than those in HA-MRSA.  Conclusions The virulence of MSSA isolates is probably higher than that of MRSA. The virulence of CA-MRSA isolates is higher than that of HA-MRSA.The different distribution of the virulence genes of these clinical SA isolates may be associated with the site of infection.

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