Identification of Staphylococcus species with the VITEK 2 system: the case of Staphylococcus hominis Academic Article uri icon


  • We read with interest the paper by Layer et al. regarding the identification of staphylococci with automated systems including VITEK-2 (bioMérieux, Marcy l'Etoile, France)(6). Of 86 strains analyzed in their study, 4 were Staphylococcus hominis and all were correctly identified by the colorimetric ID-GP VITEK-2 cards. Identical results have been reported in recent studies evaluating 13 and 14 S. hominis isolates (3, 7). Two S. hominis subspecies exist—subspecies hominis and subspecies novobiosepticus—which may be differentiated according to novobiocin susceptibility (5). S. hominis subsp. hominis is more common in clinical samples, but S. hominis subsp. novobiosepticus has recently been shown to cause bacteremia among neonates (1). VITEK-2 actually identifies S. hominis with “low discrimination,” and performance of manual novobiocin susceptibility testing is advised by …

publication date

  • January 1, 2007