检验医学 ›› 2015, Vol. 30 ›› Issue (2): 128-131.DOI: 10.3969/j.issn.1673-8640.2015.02.006

• 质谱技术在临床微生物检验中的应用专题 • 上一篇    下一篇

两种MALDI-TOF MS系统快速鉴定血培养中白念珠菌以外酵母样真菌

黄声雷1, 胡必杰1, 陈蓉2, 周春妹1   

  1. 1.复旦大学附属中山医院呼吸科,上海 200032
    2.上海市临床检验中心,上海 200126
  • 收稿日期:2014-11-10 出版日期:2015-02-28 发布日期:2015-02-12
  • 作者简介:null

    作者简介:黄声雷,男,1978年生,学士,主管技师,主要从事细菌和真菌的实验室检测及耐药机制研究。

    通讯作者:胡必杰, 联系电话:021-64041990。

Rapid identification of Yeast like fungi outside of Candida albicans isolated form blood culture by two MALDI-TOF MS systems

HUANG Shenglei1, HU Bijie1, CHEN Rong2, ZHOU Chunmei1   

  1. 1.Department of Respiratory, Zhongshan Hospital, Fudan University, Shanghai 200032, China
    2.Shanghai Centre for Clinical Laboratory, Shanghai 200126, China
  • Received:2014-11-10 Online:2015-02-28 Published:2015-02-12

摘要: 目的

评价2种基质辅助激光解析电离飞行时间质谱(MALDI-TOF MS)系统(Autoflex MALDI-TOF MS和Vitek MALDI-TOF MS)在快速鉴定血培养中分离的白念珠菌以外酵母样真菌的应用。

方法

收集复旦大学附属中山医院2010年10月至2013年1月住院患者血培养中分离的白念珠菌以外酵母样真菌59株,以真菌内转录间隔区(ITS)测序鉴定结果为金标准,比较Autoflex MALDI-TOF MS、Vitek MALDI-TOF MS和API 20C AUX 3种系统鉴定的准确性。

结果

59株菌株包含了11种真菌,其中近平滑复合体30株(占50.8%)、热带念珠菌11株(占18.6%)、光滑念珠菌8株(占13.6%)、克柔念珠菌2株(占3.4%)、新生隐球菌2株(占3.4%)、异常威克汉姆酵母2株(占3.4%)、季也蒙念珠菌复合体1株(占1.7%)、葡萄牙念珠菌1株(占1.7%)、阿萨希毛孢子菌1株(占1.7%)和酿酒酵母1株(占1.7%)。3种系统鉴定真菌总的准确性分别为Autoflex MALDI-TOF MS 93.2%、Vitek MALDI-TOF MS 83.1%和API 20C AUX 79.7%,2种MALDI-TOF MS比较,差异无统计学意义(P=0.155)。其中对白念珠菌以外酵母样真菌的鉴定准确性分别为Autoflex MALDI-TOF MS 100.0%、Vitek MALDI-TOF MS 84.9%和API 20C AUX 84.9%,2种MALDI-TOF MS比较,差异具有统计学意义(P=0.006)。对念珠菌属外的少见真菌鉴定准确性分别为Autoflex MALDI-TOF MS 33.3%、Vitek MALDI-TOF MS 66.6%和API 20C AUX 33.3%。

结论

MALDI-TOF MS系统和目前常规生化鉴定方法相比,具有快速、操作简便、结果准确等优点;对于临床血培养分离真菌的鉴定,Autoflex MALDI-TOF MS鉴定准确性和Vitek MALDI-TOF MS相似,但对常见非白念珠菌的鉴定,Autoflex MALDI-TOF MS鉴定准确性优于Vitek MALDI-TOF MS。

关键词: 基质辅助激光解析电离飞行时间质谱, 非白念珠菌, 血培养

Abstract: Objective

To evaluate the application of 2 matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS), Autoflex MALDI-TOF MS and Vitek MALDI-TOF MS, for the identification of Yeast like fungi outside of Candida albicans isolated from blood culture.

Methods

A total of 59 isolates were collected from blood culture from October 2010 to February 2013 among inpatients in Zhongshan Hospital, Fudan University. The results of fungus internal transcribed spacer (ITS) sequencing were as golden standards. The correct identification rates of Autoflex MALDI-TOF MS, Vitek MALDI-TOF MS and API 20C AUX were analyzed comparatively.

Results

The 59 isolates included 11 types of fungi, namely, Candida parapsilosis complex(30 isolates, 50.8%), Candida tropicalis(11 isolates, 18.6%), Candida glabrata(8 isolates, 13.6%), Candida krusei( 2 isolates, 3.4%), Wickerhamomy cesanomalus(2 isolates, 3.4%), Cryptococcus neoformans(2 isolates, 3.4%), Candida iusitaniae(1 isolate, 1.7%), Candida guilliermondii (1 isolate, 1.7%), Trichosporon asahii(1 isolate, 1.7%) and Saccharomyces cerevisiae (1 isolate, 1.7%). The correct identification rates by Autoflex MALDI-TOF MS, Vitek MALDI-TOF MS and API 20C AUX were 93.2%, 83.1% and 79.7%, respectively, and there was no statistical significance between the 2 MALDI-TOF MS systems (P=0.155). The correct identification rates for yeast like fungi outside of Candida albicans by Autoflex MALDI-TOF MS, Vitek MALDI-TOF MS and API 20C AUX were 100.0%, 84.9% and 84.9%, respectively, and there was statistical significance between the 2 MALDI-TOF MS systems(P=0.006). The correct identification rates of rarely clinical encountered fungi by Autoflex MALDI-TOF MS, Vitek MALDI-TOF MS and API 20C AUX were 33.3%, 66.6% and 33.3%, respectively.

Conclusions

MALDI-TOF MS system is rapid, simple and accurate compared with current routine biochemical identification methods. The performance of Autoflex MALDI-TOF MS is similar with that of Vitek MALDI-TOF MS for the identification of isolated fungi from blood culture. The performance of Autoflex MALDI-TOF MS is better than that of Vitek MALDI-TOF MS for the identification of yeast like fungi outside of Candida albicans.

Key words: Matrix-assisted laser desorption/ionization-time of flight mass spectrometry, Non-Candida albicans, Blood culture

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