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Updated: May 9, 2026

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Published on: July 11, 2016
Identification of clinical Pasteurella isolates by MALDI-TOF -- a comparison with VITEK 2 and conventional
Salah Zangenah1, Gülay Güleryüz, Stina Boräng
1Department of Laboratory Medicine, Division of Clinical Microbiology, Karolinska Institutet and Karolinska University Hospital, Huddinge, Sweden; Department of Medicine, Centre for Infectious Medicine (CIM), Karolinska Institutet and Karolinska University Hospital, Huddinge, Sweden.
Abstract:
The aim of this study was to compare the performance of four methods that are widely used in the clinical microbiology laboratory for identification of Pasteurella species. The 4 methods evaluated were VITEK2, VITEK MS (BioMerieux), and Bruker Biotyper MS (Bruker) as well as traditional biochemical tests. Sequencing of the sodA gene was used as the reference method. Sixty-five isolates of Pasteurella spp. from 65 patients were analyzed. One Pasteurella multocida isolate from American Type Culture Collection (Manassas, VA, USA) was used as a reference. Traditional biochemical tests accurately identified 62/66 (94%) isolates. Both Bruker and Vitek matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) identified 59/66 (89%) strains, but VITEK2 could only identify 32/66 (48.5%) isolates correctly. The mean time to identification using biochemical tests was 20 hours; VITEK2 took 6 hours and MALDI-TOF approximately 10 minutes. In conclusion, MALDI-TOF is a quick method, which accurately identified most isolates of Pasteurella to the species level. Thus, MALDI-TOF constitutes a valuable diagnostic tool in the clinical laboratory.
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