Table 1.
Sensitivity profiles of E. coli strains to antimicrobial agents of different antibiotic classes
| Class of antibiotics | Antibiotic | Average of zone of inhibition (range) [mm] |
Results of susceptibility* (No.**) n = 97 |
|||
|---|---|---|---|---|---|---|
| R | I | S | ||||
| Penicillins | ampicillin (AM) | 20.8 (17–29) | 0 | 0 | 97 | |
| ampicillin-sulbactam (SAM) | 23.6 (20–34) | 0 | 0 | 97 | ||
| amoxicillin-clavulanic acid (AMC) | 22.4 (18–26) | 3 | 0 | 94 | ||
| piperacillin (PRL) | 28.4 (17–33) | 1 | 0 | 96 | ||
| piperacillin-tazobactam (TPZ) | 28.1 (21–32) | 0 | 0 | 97 | ||
| ticarcillin-clavulanic acid (TTC) | 28.6 (22–31) | 0 | 1 | 96 | ||
| Cephalosporins | ceftazidime (CAZ) | 28.1 (23–31) | 0 | 0 | 97 | |
| cefuroxime (CXM) | 24.9 (20–28) | 0 | 97 | 0 | ||
| Carbapenems | imipenem (IMP) | 21.3 (12–25) | 9 | 34 | 54 | |
| meropenem (MEM) | 32.0 (24–36) | 0 | 0 | 97 | ||
| Monobactams | aztreonam (ATM) | 30.8 (25–35) | 2 | 0 | 95 | |
| Fluoroquinolones | nalidixic acid (NA)a | 36.4 (16–38) | 0 | 4 | 93 | |
| ofloxacin (OFX) | 30.8 (20–35) | 3 | 3 | 91 | ||
| Aminoglycosides | kanamycin (K)a | 22.5 (20–26) | 0 | 0 | 97 | |
| streptomycin (S)a | 14.9 (13–20) | 0 | 38 | 59 | ||
| Macrolides, lincosamides and streptogramins | azithromycin (AZM) | 24.4 (13–30) | 0 | 0 | 97 | |
| Tetracyclines | doxycycline (DO)a | 19.9 (10–26) | 5 | 2 | 90 | |
| tetracycline (TE)a | 23.9 (0–28) | 7 | 0 | 90 | ||
| Miscellaneous agents | chloramphenicol (C) | 29.1 (22–34) | 0 | 0 | 97 | |
| trimethoprim-sulfamethoxazole (TS) | 32.0 (28–35) | 0 | 0 | 97 | ||
*R- Resistant, I- Intermediate sensitive, increased exposure, S-Susceptible, standard dosing regimen; **No.- numer of strains
a interpretation of the CLSI breakpoints (CLSI Version 1.0, updated 15 May 2023)