TABLE 1.
Acquired resistance genes identified in commensal E. coli isolates
| Drug and resistance gene(s) | No. (%) identified in all isolates (n = 101) |
|---|---|
| β-Lactams | |
| blaTEM | 31 (31)a |
| blaCTX-M | 5 (5)b |
| blaSHV-1 | 1 (1) |
| blaCMY | 2 (2)c |
| Aminoglycosides | |
| strA, strB | 27, 27 (27) |
| aadA (3 alleles) | 19 (19)d |
| aadB | 1 (1) |
| aac(3)-IId | 8 (8) |
| aph(3′) | 1 (1) |
| sat | 2 (2) |
| Sulfonamides | |
| sul1 | 18 (1) |
| sul2 | 29 (29) |
| Trimethoprim | |
| dfrA (5 alleles) | 27 (27)e |
| Tetracyclines | |
| tetA | 18 (18) |
| tetB | 6 (6) |
| tetD | 4 (4) |
| Macrolides | |
| mphA | 17 (17) |
| mphB | 1 (1) |
| Phenicols | |
| cmlA | 2 (2) |
| cat | 2 (2) |
| Quinolones | |
| qnrS | 1 (1) |
a
blaTEM-1B in 29 isolates, blaTEM-1C in 1 isolate, and blaTEM-34 in 1 isolate.
b
blaCTX-M-14 in 3 isolates and blaCTX-M-27 in 2 isolates.
c
blaCMY-2 in 1 isolate and blaCMY-M-14 in 1 isolate.
d
aadA1 in 5 isolates, aadA2 in 3 isolates, and aadA5 in 11 isolates.
e
dfrA1 in 4 isolates, dfrA5 in 5 isolates, dfrA7 in 2 isolates, dfrA8 in 1 isolate, dfrA12 in 3 isolates, and dfrA17 in 12 isolates.