Table 3.
Distribution of AMR Genes with Corresponding AMR Phenotypes Detected in E. coli Isolates
| Target Genes Encoding Diverse Antimicrobial Classes | Prevalence of Target Genes Among E. coli Isolates (n = 56) No. (%)a | AMR Testing of E. coli Isolates with Corresponding Resistance Genes No. (%)a | |||||||
|---|---|---|---|---|---|---|---|---|---|
| β-Lactams Resistance Genes | Ampicillin | Amoxicillin-Clavulanate | Aztreonam | Cefoxitin | Ceftriaxone | Cefuroxime | Ceftazidime | Cefepime | |
| blaTEM | 37 (66.1) | 37 (100) | 33 (89.1) | 35 (94.5) | 26 (70.2) | 36 (97.3) | 35 (94.5) | 35 (94.5) | 34 (91.9) |
| blaCTX-M1-like genes | 24 (42.8) | 24 (100) | 19 (79.1) | 22 (91.6) | 17 (70.8) | 24 (100) | 24 (100) | 24 (100) | 24 (100) |
| blaCMY-like genes | 6 (10.7) | 6 (100) | 6 (100) | 6 (100) | 4 (66.6) | 6 (100) | 6 (100) | 6 (100) | 5 (83.3) |
| Aminoglycoside Resistance Genes | Gentamicin | Amikacin | |||||||
| aac(3)-II | 24 (42.9) | 24 (100) | 18 (75) | ||||||
| aac(6′)-Ib-cr | 14 (25) | 14 (100) | 12(85.7) | ||||||
| Quinolones Resistance Genes | Ciprofloxacin | Levofloxacin | |||||||
| qnrA | 31 (55.4) | 31 (100) | 31 (100) | ||||||
| qnrB | 17 (30.4) | 16 (94.1) | 16 (94.1) | ||||||
| qnrS | 0 (0) | 0 (0) | 0 (0) | ||||||
| aac(6)-Ib-cr | 14 (25) | 13 (92.8) | 13 (92.8) | ||||||
| Tetracyclines Resistance Genes | Tetracycline | ||||||||
| tetA | 27 (48.2) | 27 (100) | |||||||
| tetB | 14 (25) | 14 (100) | |||||||
| Sulfonamides Resistance Genes | Trimethoprim/Sulfamethoxazole | ||||||||
| sulI | 34 (60.7) | 34 (100) | |||||||
| sulII | 18 (32.1) | 18 (100) | |||||||
Note: aPercentage correlated to the total number of commensal isolates (n = 56).
Abbreviations: E. coli, Escherichia coli; AMR, antimicrobial resistance.