TABLE 1

Identifications of 61 Candida auris isolates from Korean hospitals by two MALDI-TOF MS systemsd

SystemDatabasecExtraction methodNo. (%) of isolates
Correct IDaIncomplete IDaNo IDMis-ID
BiotyperRUO library version 3.3.1.0Initial full-tube extraction46 (75.4)8 (13.1)7 (11.5)0 (0)
Additive full-tube extractionb51 (83.6)9 (14.8)1 (1.6)0 (0)
Vitek MSRUO library version 4.14On-plate extraction57 (93.4)4 (6.6)0 (0)0 (0)
IVD library version 3.2On-plate extraction59 (96.7)0 (0)2 (3.3)0 (0)
  • a The “correct ID” category includes correct identifications (IDs) of C. auris with cutoff scores of ≥1.7 by Biotyper or a confidence value of ≥75.0 by the Vitek MS with RUO library and ≥60.0 by Vitek MS with IVD library, whereas the “incomplete” category includes correct IDs of C. auris with cutoff scores of <1.7 by Biotyper or with a confidence value of <75.0 by the Vitek MS with RUO library and <60.0 by Vitek MS with IVD library.

  • b The isolates with results of “incomplete identification” or “no identification” following initial full-tube extraction were retested using the same full-tube extraction method.

  • c RUO, research use only; IVD, in vitro diagnostics.

  • d MALDI-TOF MS, matrix-assisted laser desorption ionization–time of flight mass spectrometry.