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Table 2 Correlation between slime formation (Congo red agar screening) and development of biofilm biomass (crystal violet staining).

From: Staphylococcus aureus biofilm formation at the physiologic glucose concentration depends on the S. aureus lineage

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