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J Med Microbiol 58 (2009), 1154-1159; DOI: 10.1099/jmm.0.009647-0
© 2009 Society for General Microbiology
ISSN 0022-2615

Rapid and cost-effective identification of Bartonella species using mass spectrometry

Pierre-Edouard Fournier1, Carine Couderc1, Sylvain Buffet2, Christophe Flaudrops1 and Didier Raoult1,2

1 Fédération de Microbiologie Clinique, Hôpital de la Timone, 264 rue Saint-Pierre, 13385 Marseille cedex 05, France

2 Unité des Rickettsies, CNRS-IRD UMR 6236, Faculté de Médecine, Université de la Méditerranée, 27 Boulevard Jean Moulin, 13385 Marseille cedex 05, France

Correspondence
Didier Raoult
didier.raoult{at}gmail.com

Received January 18, 2009
Accepted May 20, 2009

Bacteria of the genus Bartonella are emerging zoonotic bacteria recognized in a variety of human diseases. Due to their poor chemical reactivity, these fastidious bacteria are poorly characterized using routine phenotypic laboratory tests. Identification is usually achieved using molecular techniques that are time-consuming, expensive and technically demanding. Recently, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has emerged as a new technique for bacterial species identification. This study evaluated the use of MALDI-TOF MS for rapid genus and species identification of Bartonella species. Reference strains representing 17 recognized Bartonella species were studied. For each species, MS spectra for four colonies were analysed. The consensus spectrum obtained for each species was unique among spectra obtained for 2843 bacteria within the Bruker database, including 109 alphaproteobacteria. Thirty-nine additional blind-coded Bartonella strains were correctly identified at the species level, including 36 with a significant score. Altogether, these data demonstrate that MS is an accurate and reproducible tool for rapid and inexpensive identification of Bartonella species.






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