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Table 4 Biochemical tests that failed during the identification process by the VITEK® 2 system and by the conventional phenotypic methods

From: Comparison of methods for the identification of microorganisms isolated from blood cultures

No.

Genotypic identification

Conventional phenotypic method

VITEK® 2 system

Identification

Identification

Incorrect test

Identification

Incorrect test

3

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus hominis

dMNE−; TRE +

2

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus lentus

PolyB−

1

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus cohnii

SUC−; dTRE +

3

Staphylococcus hominis

Staphylococcus hominis

0

Staphylococcus haemolyticus

PyrA+; dMAN+

2

Staphylococcus hominis

Staphylococcus epidermidis

THIO+

Staphylococcus hominis

0

2

Staphylococcus haemolyticus

Staphylococcus warneri

URE+

Staphylococcus haemolyticus

0

1

Enterococcus faecalis

Enterococcus faecalis

0

Enterococcus gallinarum

dSOR−; dRAF+

1

Staphylococcus capitis

Staphylococcus capitis

0

Staphylococcus cohnii

βGAL+; βGUR+; SUC−; dTRE+

1

Staphylococcus epidermidis

Staphylococcus haemolyticus

URE−

Staphylococcus haemolyticus

PyrA+; URE−, PolyB−; TRE+; dMNE−

1

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus lugdunensis

PyrA+; dTRE+

1

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus scuri

PolyB−; βGUR+; NAG (+); dMAN+; dTRE+

1

Staphylococcus epidermidis

Staphylococcus epidermidis

0

Staphylococcus capitis

SUC−; dMAL−; PolyB−; URE−

1

Staphylococcus haemolyticus

Staphylococcus haemolyticus

0

Staphylococcus warneri

0

1

Klebsiella pneumoniae

Klebsiella oxytoca

Indol+

Klebsiella pneumoniae

0

  1. dMNE d-mannose, dTRE d-trehalose, PolyB polymyxin B, SUC sucrose, PyrA l-pyrrolidonylarylamidase, dMAN d-mannitol, dSOR d-sorbitol, dRAF d-raffinose, URE urea, βGAL beta-galactosidase, THIO thioglycolatebroth, βGUR beta-glucuronidase, NAG N-acetylglucosamine, 0 no errors in the tests