Table 1.
PCR screening for the presence of arcA in ST239 MRSA isolates
| Clade | No. of isolates | No. (%) of isolates with each arcA statusa |
||
|---|---|---|---|---|
| Positive | Negative | Not testedb | ||
| 1 | 149 | 125 (88) | 17 (12) | 7 |
| 2 | 11 | 0 (0) | 10 (100) | 1 |
| 3 | 13 | 1 (7.7) | 12 (92.3) | |
| 4 | 166 | 9 (5.5) | 154 (94.5) | 3 |
| 5 | 20 | 0 (0) | 20 (100) | |
| All cladesc | 360 | 135 (38.7) | 214 (61.3) | 11 |
a
Percentage of total isolates tested.
b
Isolates could no longer be cultured from the original glycerol stock.
c
Includes the single isolate represented by the PFGE pattern that does not cluster within the major clades (see Fig. 1).