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Distribution of resistance mechanisms in cephalosporin-resistant Escherichia coli
| β-Lactamase | No. (%) of cephalosporin-resistant E. coli isolates (n = 300) |
|---|---|
| CTX-M | 216 (72.0) |
| CTX-M-1 groupa | 191 (63.7) |
| CTX-M-2 group | 2 (0.7) |
| CTX-M-9 group | 22 (7.3) |
| TEM | 4 (1.3) |
| SHV | 19 (6.3) |
| CMY | 50 (16.7) |
| CMY-2 | 32 (10.7) |
| CMY-22 | 18 (6) |
| KPC | 7 (2.3) |
| FOX | 1 (0.3) |
| Unknown/not available | 9 (3) |
All were CTX-M-15.
