Table 3.
β-Lactamase variants in the study isolates; geographic and quantitative distribution
| β-Lactamase | CTX-M group | Center(s) | No. (%) of isolates | No. of clones |
|---|---|---|---|---|
| CTX-M-15 | 1 | BM, FS, GI, LH, TA | 175 (76.4) | 27 |
| CTX-M-2 | 2 | FS, LH, TA | 11 (4.8) | 5 |
| CTX-M-14a | 9 | TA | 5 (2.1) | 4 |
| CTX-M-1 | 1 | BM, FS, GI | 4 (1.7) | 3 |
| CTX-M-39 | 25 | LH, TA | 3 (1.3) | 3 |
| CTX-M-9 | 9 | GI | 2 (0.9) | 2 |
| CTX-M-3 | 1 | GI | 1 (0.4) | 1 |
| CTX-M-40 | 8 | BM | 1 (0.4) | 1 |
| SHV-5 | BM, FS, TA | 7 (3.1) | 6 | |
| SHV-12 | BM, TA | 7 (3.1) | 7 | |
| SHV-2 | BM, GI | 3 (1.3) | 2 | |
| SHV-2a | GI, TA | 3 (1.3) | 2 | |
| SHV-27 | TA | 2 (0.9) | 1 | |
| TEM-3 | BM | 2 (0.9) | 2 | |
| CMY-2 | BM, LH | 2 (0.9) | 2 | |
| DHA-1 | GI | 1 (0.4) | 1 | |
| Total | 229 |
a
CTX-M-14 was encoded by the blaCTX-M-14a (n = 4) or blaCTX-M-14b (n = 1) gene.