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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