Rapid identification of methicillin-resistant Staphylococcus aureus and methicillin-sensitive Staphylo-coccus aureus strains by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
10.3760/cma.j.issn.0254-5101.2015.01.009
- VernacularTitle:基质辅助激光解吸／电离飞行时间质谱仪快速鉴别甲氧西林耐药和甲氧西林敏感金黄色葡萄球菌的研究
- Author:
Yanyan HU
;
Jiachang CAI
;
Hongwei ZHOU
;
Yan JIANG
;
Rong ZHANG
- Publication Type:Journal Article
- Keywords:
MALDI-TOF MS;
MRSA;
MSSA
- From:
Chinese Journal of Microbiology and Immunology
2015;(1):42-45
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the capability of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry ( MALDI-TOF MS) for rapid identification of methicillin-resistant Staphylo-coccus aureus (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA) strains.Methods Twenty-five MRSA and thirty MSSA isolates were collected from the Second Affiliated Hospital of Zhejiang University School of Medicine as the experiment group .Twelve MRSA and twenty-two MSSA clinical strains were isola-ted as the control .All strains were identified by MALDI-TOF MS and the results were further analyzed by ClinProTools 3.0 software.Results Four algorithms including support vector machine (SVM), genetic al-gorithm ( GA) , supervised neural network ( SNN) and quick classifier ( QC) showed similar results in dis-tinguishing MRSA from MSSA isolates .The sensitivity of GA was 100 .0%and the sensitivities of other algo-rithms were all greater than 95.0%.The specificities of GA, SVM and QC were all greater than 90.0%. The areas under the receiver operating characteristic ( ROC) curves of four characteristic peaks at mass-to-charge ratios (m/z) of 3279, 6485, 6555 and 3299 m/z were all greater than 0.9.The virtual gel view showed that the bands generated by MSSA isolates at 3279 , 6485 and 6555 m/z were obviously deeper in color than those generated by MRSA isolates .However , the bands of MSSA isolates at 3299 m/z were appar-ently lighter in color than those of MRSA isolates .83.3%of MRSA and 90.0%of MSSA isolates from the control group were correctly identified by the GA model .Conclusion MALDI-TOF MS could rapidly and accurately identify MRSA from MSSA isolates under the strictly controlled experimental conditions with the advantages of less time-consuming, high sensitivity and high specificity .The accurate identification of MRSA from MSSA isolates could be applied for the prevention and treatment of MRSA infection .
