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Table 3 Sensitivity, Specificity, Negative/Positive Predictive values for the common diagnostic tests for clinical S. aureus

From: Identification of Staphylococcus aureus: DNase and Mannitol salt agar improve the efficiency of the tube coagulase test

Test Sensitivity (%) Specificity (%) NPV (%) PPV (%)
MSA 94 79 92 83
DNase 75 96 77 96
1Human plasma 91 11 33 54
2Sheep plasma 81 7 25 50
MSA/DNase 96 92 92 96
Human plasma/MSA 33 100 100 82
Human plasma/DNase 75 100 100 95
Human plasma/DNase/MSA 75 100 100 94
Sheep plasma/MSA 25 100 100 80
Sheep plasma/DNase 50 100 100 95
Sheep plasma/MSA/DNase 67 100 100 95
  1. 1: Tube coagulase (human plasma)
  2. 2: Tube coagulase (sheep plasma)
  3. MSA: Mannitol salt agar
  4. DNase: Deoxyribonuclease
  5. PCR: Polymerase Chain Reaction