TABLE 2.
Discrepant and indeterminate results of VITEK 2 tests compared to the results of the mecA PCR
| Identification | mecA PCR resulta | Oxacillin MIC (μg/ml)
|
Susceptibility by oxacillin resistance testb
|
||
|---|---|---|---|---|---|
| Initial test | Retest | Initial test | Retest | ||
| S. kloosii | − | ≥8 | ≥8 | R | R |
| S. saprophyticus | − | 4 | 4 | S | S |
| S. saprophyticus | − | 2 | 2 | S | S |
| S. saprophyticus | − | 2 | 1 | S | S |
| S. saprophyticus | − | 1 | 0.5 | S | S |
| S. saprophyticus | − | 1 | 2 | S | S |
| S. saprophyticus | − | ≤0.5 | 0.5 | S | S |
| S. cohnii | − | 2 | 2 | S | S |
| S. cohnii | − | 2 | 2 | S | S |
| S. xylosus | − | 1 | 0.5 | S | S |
| S. lugdunensis | − | 1 | 1 | S | S |
| S. lugdunensis | − | 1 | 0.5 | S | S |
| S. lugdunensis | − | ≤0.5 | 0.5 | S | S |
| S. lugdunensis | − | ≤0.5 | 0.5 | S | S |
| S. epidermidis | − | 2 | 2 | S | S |
| S. epidermidis | + | 1 | 2 | S | S |
| S. hominis | + | ≤0.5 | 0.5 | S | S |
| S. haemolyticus | + | ≤0.5 | ≤0.25 | S | S |
| S. saprophyticus | + | No growth | ≥8 | No growth | R |
| S. saprophyticus | + | No growth | No growth | No growth | No growth |
| S. epidermidis | − | No growth | ≤0.5 | No growth | S |
+, positive; −, negative.
S, susceptible; R, resistant.