| 陈荣,沈定霞,闫中强,王欢.47株金黄色葡萄球菌临床血流感染分离株的基因分型研究[J].Chinese journal of Epidemiology,2010,31(3):312-315 |
| 47株金黄色葡萄球菌临床血流感染分离株的基因分型研究 |
| Genotyping on 47 Staphylococcus aureus strains associated with bloodstream infection |
| Received:September 19, 2009 |
| DOI： |
| KeyWord: 金黄色葡萄球菌 血流感染 抗药性 基因分型 分子流行病学 |
| English Key Word: Staphylococcus aureus Bloodstream infection Drug-resistance Genotyping Molecular epidemiology |
| FundProject: |
| Author Name | Affiliation | E-mail | | CHEN Rong | Department of Microbiology, PLA General Hospital, Beijing 100853, China | | | SHEN Ding-xia | Department of Microbiology, PLA General Hospital, Beijing 100853, China | shendx301@yahoo.com | | YAN Zhong-qiang | Department of Microbiology, PLA General Hospital, Beijing 100853, China | | | WANG Huan | Department of Microbiology, PLA General Hospital, Beijing 100853, China | |
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| Abstract: |
| 目的 研究金黄色葡萄球菌临床血流感染分离株的分子流行病学特征.方法 收集2006年1月至2008年12月解放军总医院分离的临床血流感染金黄色葡萄球菌菌株(共47株),标本来源均为患者静脉血.采用琼脂稀释法检测所有菌株对多种抗生素的耐药性,PCR方法 检测pvl毒素基因,DiversiLab~(TM)Rep-PCR分型系统分析菌株的同源性;对耐甲氧西林金黄色葡萄球菌(MRSA)进行葡萄球菌染色体/mec(SCCmec)分型以及ST239型别的快速筛查;综合分型和药敏试验结果,挑选部分代表菌株进行多位点序列分型(MLST).结果 47株血流感染金黄色葡萄球菌中,pvl基因检出率为4.3%.MRSA占51.1%.MRSA均为SCCmec Ⅲ型菌株;Rep-PCR分为A～L共12个型,其中A型为最主要的型,共22株(46.8%),所有的MRSA均属于A、B两型.结论 47株临床血流感染金黄色葡萄球菌中的MRSA绝大部分为多重耐药克隆ST239-MRSA-SCCmecⅢ型. |
| English Abstract: |
| Objective To investigate the molecular epidemiological characteristics of Staphylococcus aureus associated with bloodstream infection in hospital. Methods 47 Staphylococcus aureus strains isolated from bloodstream in PLA General Hospital were collected from January 2006 to December 2008. Susceptibility of the strains to 11 antimicrobial agents was detected and DNA homology of them was analyzed with Rep-based DiversiLab~(TM) Microbial Typing System. Panton-Valentine leukocidin (PVL)gene was determined by PCR. For methicillin-resistant Staphylococcus aureus (MRSA) strains,the genotypes of SCCmec were determined and ST239 clone was screened with multiplex PCR. Multilocus sequence typing (MLST) was used to determine the STs of the selected isolates. Results In the 47 Staphylococcus aureus isolated from blood,methicillin-resistant strains accounted for 51.1%,all belonged to SCCmec Ⅲ type,with only 2 pvl gene positive strains identified. 12 different patterns (A-L) were found among 47 strains with Rep-PCR. All MRSA strains clustered in the A and B subtypes. Conclusion Most MRSA strains isolated from blood in PLA General Hospital belonged to ST239-MRSA-SCCmec Ⅲ clone. DiversiLab~(TM) Microbial Typing System could provide a rapid and effective method to investigate the molecular epidemiological characteristics of Staphylococcus aureus in the hospital settings. |
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