Universität zu Köln

Hamprecht, Axel ORCID: 0000-0003-1449-5780, Christ, Sara, Oestreicher, Tanja, Plum, Georg, Kempf, Volkhard A. J. and Goettig, Stephan (2014). Performance of two MALDI-TOF MS systems for the identification of yeasts isolated from bloodstream infections and cerebrospinal fluids using a time-saving direct transfer protocol. Med. Microbiol. Immunol., 203 (2). S. 93 - 100. NEW YORK: SPRINGER. ISSN 1432-1831

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Abstract

The rapid and correct identification of pathogens is of paramount importance for the treatment of patients with invasive infections. Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) can speed up the identification of bacteria and fungi and has quickly been embraced by medical microbiology laboratories worldwide. Different MALDI-TOF systems have been compared in studies focussing on identification rates of different pathogens. Another aspect that has not been systematically assessed is the performance in daily routine and handling, which is important especially for microbiology routine laboratories. We compared two widespread commercial systems, Microflex LT Biotyper (Bruker) and VitekMS (bioM,rieux), for the identification of 210 relevant clinical yeasts under routine conditions, using a time-saving direct transfer protocol. We assessed the need for an additional extraction step, the threshold for species identification and the duration of measurements with the two systems. The tested yeasts included 34 Candida albicans isolates, 144 non-albicans Candida spp. and 32 yeasts of different genera. The results of the two MS systems were compared with that of biochemical identification and, in case of discrepancies, DNA sequencing of the internal transcribed spacer or the large subunit of ribosomal DNA. Both systems correctly identified 96.2 % of isolates [202/210, non-significant (n.s.)]. Misidentifications were observed for VitekMS only (n = 5, no major errors, n.s.). VitekMS was the slower system (19.8 vs. 8.0 min for 10 samples, p = 0.002) but had the advantage of a more effective direct transfer protocol with less need for an additional extraction step.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hamprecht, Axel UNSPECIFIED orcid.org/0000-0003-1449-5780 UNSPECIFIED Christ, Sara UNSPECIFIED UNSPECIFIED UNSPECIFIED Oestreicher, Tanja UNSPECIFIED UNSPECIFIED UNSPECIFIED Plum, Georg UNSPECIFIED UNSPECIFIED UNSPECIFIED Kempf, Volkhard A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goettig, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-441726
DOI:	10.1007/s00430-013-0319-9
Journal or Publication Title:	Med. Microbiol. Immunol.
Volume:	203
Number:	2
Page Range:	S. 93 - 100
Date:	2014
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-1831
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DESORPTION IONIZATION-TIME; FLIGHT MASS-SPECTROMETRY; ESCMID-ASTERISK GUIDELINE; MANAGEMENT; DIAGNOSIS; BIOTYPER Multiple languages Immunology; Microbiology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44172