title: Evaluation of the colorimetric VITEK 2 card for identification of gram-negative nonfermentative rods: comparison to 16S rRNA gene sequencing.
abstract: Ninety strains of a collection of well-identified clinical isolates of gram-negative nonfermentative rods collected over a period of 5 years were evaluated using the new colorimetric VITEK 2 card. The VITEK 2 colorimetric system identified 53 (59%) of the isolates to the species level and 9 (10%) to the genus level; 28 (31%) isolates were misidentified. An algorithm combining the colorimetric VITEK 2 card and 16S rRNA gene sequencing for adequate identification of gram-negative nonfermentative rods was developed. According to this algorithm, any identification by the colorimetric VITEK 2 card other than Achromobacter xylosoxidans, Acinetobacter sp., Burkholderia cepacia complex, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia should be subjected to 16S rRNA gene sequencing when accurate identification of nonfermentative rods is of concern.
authors.affiliation: Institut für Medizinische Mikrobiologie, Universität Zürich, Gloriastrasse 32, 8006 Zürich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Zbinden
authors.forename: E C
authors.initials: EC
authors.lastname: Böttger
authors.forename: P P
authors.initials: PP
authors.lastname: Bosshard
authors.forename: R
authors.initials: R
authors.lastname: Zbinden
mesh_terms: D015373:Bacterial Typing Techniques / Q000295:instrumentation* / Q000379:methods; D003124:Colorimetry / Q000379:methods*; D006090:Gram-Negative Bacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D016905:Gram-Negative Bacterial Infections / Q000175:diagnosis / Q000382:microbiology*; D006801:Humans; D012336:RNA, Ribosomal, 16S / Q000235:genetics*; D011933:Reagent Kits, Diagnostic
chemical_list: D012336:RNA, Ribosomal, 16S; D011933:Reagent Kits, Diagnostic