TABLE 2.
Discrepancies between the MRSA-Screen test, mecA gene detection by PCR, and phenotypic tests for the detection of methicillin resistance among 200 S. aureus clinical isolates
| No. of isolates | Resulta for:
|
|||
|---|---|---|---|---|
| MRSA-Screenb | mecA gene detection | Oxacillin disk diffusionc | Oxacillin-salt agar screend | |
| 1 | +e | − | − | − |
| 4 | − | − | + | − (2), + (2) |
| 20 | + | + | − | − (14), + (6) |
a
+, resistant; −, susceptible.
b
Agglutination.
c
Inhibition zone diameters were ≤10 mm for resistant isolates and ≥13 mm for susceptible isolates.
d
Growth indicated resistance; no growth indicated susceptibility. The number of isolates with each result is given in parentheses after the symbol.
e
This isolate, when retested, gave no agglutination.