Multicenter evaluation of the new VITEK 2 advanced colorimetric yeast identification card

D. Jane Hata, Leslie Hall, Annette W. Fothergill, Davise H. Larone, Nancy L. Wengenack

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


The performance of the new VITEK 2 Advanced Colorimetry yeast identification (YST) card for use with the VITEK 2 system (bioMérieux, Inc., Hazelwood, MO) was compared to that of the API 20C AUX (API) system (bioMérieux SA, Marcy-l'Etoile, France) in a multicenter evaluation. A total of 12 quality control, 64 challenge, and 623 clinical yeast isolates were used in the study. Comparisons of species identification, platform reliability, and substrate reproducibility were made between YST and API, with API considered the reference standard. Qualify control testing to assess system and substrate reproducibility matched expected results ≥95% of the time. The YST card correctly identified 100% of the challenge strains, which covered the species range of the manufacturer's performance claims. Using clinical isolates, the YST card correctly identified 98.5%, with 1.0% of isolates incorrectly identified and 0.5% unidentified. Among clinical isolates, the YST card generated fewer low-discrimination results (18.9%) than did API (30.0%). The time to identification with YST was 18 h, compared to 48 to 72 h with API. The colorimetric YST card used with the VITEK 2 provides a highly automated, objective yeast identification method with excellent performance and reproducibility. We found this system useful for timely and accurate identification of significant yeast species in the clinical microbiology laboratory.

Original languageEnglish (US)
Pages (from-to)1087-1092
Number of pages6
JournalJournal of clinical microbiology
Issue number4
StatePublished - Apr 2007

ASJC Scopus subject areas

  • Microbiology (medical)


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