TABLE 2.
Resistance genes and phylotypes of ESBL-producing E. coli isolates
| β-Lactamase gene | No. (%) of isolates | No. of isolates of phylotype: |
|||
|---|---|---|---|---|---|
| A | B1 | B2 | D | ||
| CTX-M | 57 (81) | 26 | 0 | 18 | 13 |
| CTX-M-15 | 46 (66) | 25a | 0 | 15b | 6 |
| CTX-M-2 | 1 (1) | 0 | 0 | 0 | 1 |
| CTX-M-9 group | 10 (14) | 1 | 0 | 3 | 6 |
| CTX-M-9 | 1 (1) | 0 | 0 | 0 | 1 |
| CTX-M-14 | 8 (11) | 1 | 0 | 3c | 4 |
| CTX-M-65 | 1 (1) | 0 | 0 | 0 | 1d |
| SHV-5 or -7 | 10 (14) | 1 | 1 | 5e | 3 |
| TEM-10 | 1 (1) | 0 | 0 | 1 | 0 |
| CMY-2 or -32 | 2 (3) | 0 | 0 | 0 | 2 |
| Total | 70 | 27 | 1 | 24 | 18 |
a
All isolates possessed blaOXA-1 and aac-6′-Ib, and 19 isolates shared ≥75% similarities based on PFGE.
b
All 15 isolates were O25-ST131. The presence of blaTEM, blaOXA-1, and aac-6′-Ib differed among the isolates.
c
All isolates were O25-ST131.
d
This isolate also possessed blaCMY-2.
e
Three isolates were O25-ST131.