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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.