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Table 2 Sensitivity and specificity of phenotypic methods for the detection of biofilm production in coagulase-negative staphylococci

From: Comparison of methods for the detection of biofilm production in coagulase-negative staphylococci

Method

 

ica Positive*

ica negative**

Sensitivity %

Specificity %

Tube test

Adherent

82

0

100

100

 

Non-adherent

0

18

  

Plate test

Adherent

80

1

97,6

94,4

 

Non-adherent

2

17

  

CRA test

Adherent

73

0

89

100

 

Non-adherent

9

18

  
  1. * ica positive: Positive for icaA and icaD or icaACD.
  2. ** ica negative: Negative for icaA and icaD or icaACD.
  3. CRA: Congo red agar.