TABLE 4.

Comparison of IDI-MRSA assay, GenoType MRSA Direct, and selective MRSA agars in the detection of MRSA with groin and axilla swabsa

TestNo. of positive samplesbNo. of negative samplesbNo. of inhibited samplesSensitivity (%)Specificity (%)PPV (%)NPV (%)
Molecular detection tests
    IDI-MRSA2280280979094
    GenoType MRSA Direct2078668968590
Selective agars at 24 h
    MRSA ID188668989491
    MRSASelect149052989387
    CHROMagar MRSA10944010010084
Selective agars at 48 h
    MRSA ID634184473390
    MRSASelect426260663684
    CHROMagar MRSA356948703481
  • a PPV, positive predictive value; NPV, negative predictive value.

  • b True positive (n = 25) and true negative (n = 79) samples, defined as described in the text.