Table 3.
Resistance frequency of the tested antimicrobial agents in all and MDR Gram negative isolates
| Antimicrobial agent | Total Gram negative isolates | MDR Gram negative isolates | ||||
|---|---|---|---|---|---|---|
| Total no. tested | R (%) | S (%) | Total no. tested | R (%) | S (%) | |
| Amikacin | 547 | 165 (30.2%) | 382 (69.8%) | 462 | 165 (35.7%) | 297 (64.3%) |
| Amoxicillin/clavulanate | 522 | 397 (76.1%) | 125 (23.9%) | 419 | 359 (85.7%) | 60 (14.3%) |
| Ampicillin | 66 | 48 (72.7%) | 18 (27.3%) | 26 | 25 (96.2%) | 1 (3.8%) |
| Ampicillin/sulbactam | 436 | 309 (70.9%) | 127 (29.1%) | 369 | 291 (78.8%) | 78 (21.2%) |
| Aztreonam | 487 | 341 (70.1%) | 146 (29.9%) | 410 | 337 (82.2%) | 73 (17.8%) |
| Cefaclor | 318 | 264 (83.1%) | 54 (16.9%) | 272 | 254 (93.4%) | 18 (6.6%) |
| Cefepime | 580 | 431 (74.3%) | 149 (25.7%) | 467 | 418 (89.5%) | 49 (10.5%) |
| Cefotaxime | 234 | 182 (77.8%) | 52 (22.2%) | 190 | 176 (92.6%) | 14 (7.4%) |
| Cefoxitin | 460 | 204 (44.3%) | 256 (55.7%) | 396 | 199 (50.3%) | 197 (49.7%) |
| Ceftazidime | 552 | 414 (75.0%) | 138 (25.0%) | 446 | 394 (88.3%) | 52 (11.7%) |
| Ceftriaxone | 326 | 240 (73.6%) | 86 (26.3%) | 254 | 228 (89.8%) | 26 (10.2%) |
| Chloramphenicol | 66 | 20 (30.3%) | 46 (69.7%) | 27 | 17 (62.9%) | 10 (37.1%) |
| Ciprofloxacin | 342 | 218 (63.7%) | 124 (36.3%) | 265 | 207 (78.1%) | 58 (21.9%) |
| Colistin | 200 | 9 (4.5%) | 191 (95.5%) | 170 | 5 (2.9%) | 165 (97.1%) |
| Cotrimoxazole | 499 | 369 (73.9%) | 130 (26.1%) | 411 | 359 (87.3%) | 52 (12.7%) |
| Doxycycline | 190 | 116 (61.1%) | 74 (38.9%) | 163 | 116 (71.2%) | 47 (28.9%) |
| Ertapenem | 16 | 13 (81.2%) | 3 (18.8%) | 15 | 13 (86.7%) | 2 (13.3%) |
| Fosfomycin | 83 | 5 (6.1%) | 78 (93.9%) | 66 | 5 (7.6%) | 61 (92.4%) |
| Gentamicin | 521 | 235 (45.1%) | 286 (54.9%) | 436 | 230 (53.8%) | 206 (47.2%) |
| Imipenem | 426 | 128 (30.04%) | 298 (69.6%) | 347 | 126 (36.3%) | 221 (63.7%) |
| Levofloxacin | 342 | 191 (55.8%) | 151 (44.2%) | 281 | 189 (67.3%) | 92 (32.7%) |
| Meropenem | 272 | 97 (35.6%) | 175 (64.4%) | 211 | 97 (45.9%) | 114 (54.1%) |
| Nitrofurantoin | 280 | 93 (33.2%) | 187 (66.8%) | 244 | 89 (36.5%) | 155 (63.5%) |
| Norfloxacin | 277 | 162 (58.5%) | 115 (41.5%) | 240 | 160 (66.7%) | 80 (33.3%) |
| Ofloxacin | 160 | 90 (56.2%) | 70 (43.8%) | 126 | 87 (69.1%) | 39 (30.9%) |
| Piperacillin/tazobactam | 587 | 258 (43.9%) | 329 (56.1%) | 469 | 256 (54.6%) | 213 (45.4%) |
| Tetracycline | 347 | 238 (68.5%) | 109 (31.5%) | 275 | 217 (78.9%) | 58 (21.1%) |
| Tigecycline | 15 | 8 (53.3%) | 7 (46.7%) | 14 | 8 (57.1%) | 6 (42.9%) |
R (%) – number of resistant isolates (percentage); S (%) – number of susceptible isolates (percentage); MDR – multidrug resistance.