title: An improved MLVF method and its comparison with traditional MLVF, spa typing, MLST/SCCmec and PFGE for the typing of methicillin-resistant Staphylococcus aureus.
abstract: Methicillin-resistant Staphylococcus aureus (MRSA) has become an important nosocomial pathogen, causing considerable morbidity and mortality. During the last 20 years, a variety of genotyping methods have been introduced for screening the prevalence of MRSA. In this study, we developed and evaluated an improved approach capillary gel electrophoresis based multilocus variable-number tandem-repeat fingerprinting (CGE/MLVF) for rapid MRSA typing. A total of 42 well-characterized strains and 116 non-repetitive clinical MRSA isolates collected from six hospitals in northeast China between 2009 and 2010 were tested. The results obtained by CGE/MLVF against clinical isolates were compared with traditional MLVF, spa typing, Multilocus sequence typing/ staphylococcal cassette chromosome mec (MLST/SCCmec) and pulse field gel electrophoresis (PFGE). The discriminatory power estimated by Simpson's index of diversity was 0.855 (28 types), 0.855 (28 patterns), 0.623 (11 types), 0.517 (8 types) and 0.854 (28 patterns) for CGE/MLVF, traditional MLVF, spa typing, MLST/SCCmec and PFGE, respectively. All methods tested showed a satisfied concordance in clonal complex level calculated by adjusted Rand's coefficient. CGE/MLVF showed better reproducibility and accuracy than traditional MLVF and PFGE methods. In addition, the CGE/MLVF has potential to produce portable results. In conclusion, CGE/MLVF is a rapid and easy to use MRSA typing method with lower cost, good reproducibility and high discriminatory power for monitoring the outbreak and clonal spread of MRSA isolates.
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. duxuefei82@163.com.
authors.forename: Xue-Fei
authors.initials: XF
authors.lastname: Du
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. xmpumch@126.com.
authors.forename: Meng
authors.initials: M
authors.lastname: Xiao
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. lhyhydsy@126.com.
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Liang
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. sunsz00000@163.com.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Sun
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. jiangyuehonghydsy@126.com.
authors.forename: Yue-Hong
authors.initials: YH
authors.lastname: Jiang
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. cgyhydsy@126.com.
authors.forename: Guo-Yu
authors.initials: GY
authors.lastname: Chen
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. mxyhydsy@126.com.
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Meng
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. zglhydsy@126.com.
authors.forename: Gui-Ling
authors.initials: GL
authors.lastname: Zou
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. zlpumch@126.com.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. lylpumch@126.com.
authors.forename: Ya-Li
authors.initials: YL
authors.lastname: Liu
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. zhpumch@126.com.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. shlpumch@126.com.
authors.forename: Hong-Li
authors.initials: HL
authors.lastname: Sun
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. jiangxiaofeng12359@126.com.
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Jiang
authors.affiliation: Department of Clinical Laboratory, the Fourth Affiliated Hospital of Harbin Medical University, No. 37, Yiyuan Street, Nangang, Harbin 150001, Heilongjiang, China. xycpumch@126.com.
authors.forename: Ying-Chun
authors.initials: YC
authors.lastname: Xu
mesh_terms: D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000032:analysis*; D019075:Electrophoresis, Capillary; D016521:Electrophoresis, Gel, Pulsed-Field; D055624:Methicillin-Resistant Staphylococcus aureus / Q000235:genetics* / Q000302:isolation & purification; D058885:Multilocus Sequence Typing; D060885:Multiplex Polymerase Chain Reaction; D013205:Staphylococcal Protein A / Q000235:genetics*; D020080:Tandem Repeat Sequences / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D013205:Staphylococcal Protein A