Table 2

Correlation between slime formation (Congo red agar screening) and development of biofilm biomass (crystal violet staining).

Glucose

Sensitivity

Specificity

PPV

NPV

CRA+/CV+

CRA-/CV+

CRA+/CV-

CRA-/CV-

(%)

(%)

(%)

(%)

(%)

Number of S. aureus strains


0

6.3

91.0

5.0

92.8

1

15

19

193

0.1

9.7

91.3

15.0

86.5

3

28

17

180

0.25

11.6

93.0

45.0

63.5

11

76

9

132

0.5

8.3

80.0

90.0

3.9

18

200

2

8


(PPV) positive predictive value (NPV) negative predictive value (CRA) Congo red agar screening (CV) crystal violet staining

Croes et al. BMC Microbiology 2009 9:229   doi:10.1186/1471-2180-9-229

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