Table 2. Number of isolates showing halos ≥1.5 cm (susceptibility, S) or not (resistance, R) around cefoxitin (FOX), cefepime (FEP), and imipenem (IMP) disks according to the type of resistance.
| Mechanisms | Microorganisms | IMP/FEP/FOX | Total | |||||
|---|---|---|---|---|---|---|---|---|
| S/S/S | S/R/S | R/R/R | S/S/R | R/S/R | S/R/R | |||
| Other mechanisms | S. maltophilia | – | – | – | – | 3 | – | 3 |
| AmpC | K. oxytoca | 1 | – | – | – | – | – | 1 |
| K. pneumoniae | 2 | – | – | – | – | – | 2 | |
| P. mirabilis | – | – | 1 | – | – | – | 1 | |
| K. aerogenes | – | – | – | 2 | – | – | 2 | |
| E. cloacae | 2 | 1 | – | 12 | – | 1 | 16 | |
| E. coli | 4 | – | – | – | – | – | 4 | |
| C. amalonaticus | 1 | – | – | – | – | – | 1 | |
| C. freundii | 1 | – | – | – | – | – | 1 | |
| CBP | ||||||||
| OXA | K. pneumoniae | – | – | – | – | – | – | 4 |
| A. baumannii | – | – | 1 | 14 | – | – | 15 | |
| VIM | E. coli | 1 | – | – | – | – | – | 1 |
| P. aeruginosa | – | – | 1 | – | – | – | 1 | |
| K. oxytoca | 2 | – | – | 1 | – | – | 3 | |
| K. pneumoniae | – | – | – | 2 | – | – | 2 | |
| E. cloacae | 1 | – | – | 3 | – | – | 4 | |
| IMPase | K. pneumoniae | – | – | – | 1 | – | – | 1 |
| P. aeruginosa | – | – | 5 | – | 10 | – | 15 | |
| KPC | K. pneumoniae | 4 | – | 3 | 1 | – | – | 8 |
| ESBL | P. mirabilis | 2 | – | – | – | – | – | 2 |
| E. coli | 38 | – | – | – | – | – | 38 | |
| K. pneumoniae | 36 | 7 | – | – | – | – | 43 | |
CBP, carbapenemases; ESBL, extended spectrum β-lactamases; KPC, Klebsiella pneumoniae carbapenemases; IMPase, carbapenemases type IMP; VIM, Verona integron-encoded metallo-beta-lactamase; OXA, oxacillinases.