Table 1. Number of isolates grown on CHROMID ESBL medium, percentage by microorganism, and mean percentage by type of resistance.
| Resistance mechanisms | Microorganisms | No. isolates | Positive growth (%) | Mean % growth |
|---|---|---|---|---|
| ESBL | Klebsiella pneumoniae | 43 | 43 (100.0) | 100.0 |
| Proteus mirabilis | 2 | 2 (100.0) | ||
| Escherichia coli | 38 | 38 (100.0) | ||
| Carbapenemases | 94.7 | |||
| KPC | Klebsiella pneumoniae | 8 | 8 (100.0) | 100.0 |
| IMPase | Pseudomonas aeruginosa | 16 | 15 (93.8) | 94.1 |
| Klebsiella pneumoniae | 1 | 1 (100.0) | ||
| VIM | Enterobacter cloacae | 4 | 4 (100.0) | 91.7 |
| Klebsiella pneumoniae | 3 | 2 (66.7) | ||
| Klebsiella oxytoca | 3 | 3 (100.0) | ||
| Pseudomonas aeruginosa | 1 | 1 (100.0) | ||
| Escherichia coli | 1 | 1 (100.0) | ||
| OXA | Acinetobacter baumannii | 15 | 15 (100.0) | 95.0 |
| Klebsiella pneumoniae | 4 | 4 (100.0) | ||
| Klebsiella oxytoca | 1 | 0 (0) | ||
| AmpC | Citrobacter freundii | 2 | 1 (50.0) | 80.0 |
| Citrobacter amalonaticus | 1 | 1 (100.0) | ||
| Escherichia coli | 7 | 4 (57.1) | ||
| Enterobacter cloacae | 16 | 16 (100.0) | ||
| Klebsiella aerogenes | 2 | 2 (100.0) | ||
| Proteus mirabilis | 2 | 1 (50.0) | ||
| Klebsiella pneumoniae | 2 | 2 (100.0) | ||
| Klebsiella oxytoca | 1 | 1 (100.0) | ||
| Raoutella ornithinolytica | 1 | 0 (0) | ||
| Serratia marcescens | 1 | 0 (0) | ||
| Other mechanisms | Stenotrophomonas maltophilia | 3 | 3 (100.0) | 100.0 |
ESBL, extended-spectrum β-lactamases; KPC, Klebsiella pneumoniae carbapenemases; IMPase, carbapenemases type IMP; VIM, Verona integron-encoded metallo-beta-lactamase; OXA, oxacillinases.