TABLE 2.
Characteristics of the 19 mecA gene-positive (MRSA) strains for which the MRSA screen test was negative or the oxacillin agar screen test showed no growth
| Isolate no. | MRSA screen test resulta | Oxacillin agar screen test resulta | E-test MIC (μg/ml) | E-test interpre-tationa | Phage type |
|---|---|---|---|---|---|
| 1 | S | S | 0.75 | S | III-79 |
| 2 | S | S | 1.5b | R | Z-84 |
| 3 | S | R | 6 | R | Z-75 |
| 4 | S | R | 8 | R | III-145 |
| 5 | R | S | 0.75 | S | III-76 |
| 6 | R | S | 0.75 | S | XI-6 |
| 7 | R | S | 1 | S | III-17 |
| 8 | R | S | 1 | S | I/III-6 |
| 9 | R | S | 1.5 | S | Z-53 |
| 10 | R | S | 1.5 | S | Z-79 |
| 11 | R | S | 1.5 | S | Z-82 |
| 12 | R | S | 1.5 | S | Z-94 |
| 13 | R | S | 2 | S | Z-58 |
| 14 | R | S | 2 | S | XVI |
| 15 | R | S | 2b | R | Z-77 |
| 16 | R | S | 3 | R | Z-52 |
| 17 | R | S | 3 | R | I-2 |
| 18 | R | S | 6 | R | XI-5 |
| 19 | R | S | 64 | R | Z-90 |
a
R, resistant (MRSA screen test positive or growth by oxacillin agar screen test); S, susceptible (MRSA screen test negative or no growth by oxacillin agar screen test).
b
Colonies within the elliptic zone of inhibition (heterogeneously resistant).