Table 6.

Comparison of miscellaneous growth and tolerance tests used in systems for identification of gram-positive bacteria

CharacteristicIdentification systema
IdentifiesMicrococcaceae andStreptococcaceaeIdentifiesMicrococcaceaeIdentifies Streptococcaceae
MS GPMS Rapid GPVitek GPIPasco GP IDAPI Staph IDGeary et al. (86)Kloos and Bannerman (129)API Staph ID 32StaphZymRapID STRRapid ID 32 StrepAPI 20 Strep
Colony size+
Colony pigmentation+
Aerobic growth+
Anaerobic growth+
Growth in presence of:
 Bacitracin+++
 10% bile+
 40% bile+
 Colistin (polymyxin)+
 Crystal violet+
 Deferoxamine+
 Furazolidone+
Micrococcus screen (Bacitracin)+
 Novobiocin+++++++
 Optochin+++
 Polymyxin B+
 Sodium chloride (%)6.566.5
 Tetrazolium red+
 Peptone base+
No. of tests608401614000
  • a For an explanation of the identification systems, see Table 1, footnote a.