Table 1. Comparison of bacterial species identification and resistance to third-generation cephalosporins by CHROMagar ESBL media with MALDI-TOF-MS and VITEK-2.
| CHROMagar ESBL colour (no., %) | MALDI-TOF-MS identification | No. of isolates | Resistant to ceftriaxone and ceftazidime (no., %) |
| Pink: 510 (91.1)Blue: 48 (8.6)Green: 2 (0.4) | Escherichia spp. | 560 | 551 (98.4) |
| Pink: 11 (9.0)Blue: 108 (88.5)Green: 3 (2.5) | Klebsiella spp. | 122 | 112 (91.8) |
| Pink: 3 (13.0)Blue: 19 (82.6)Green: 1 (4.3) | Enterobacter spp. | 23 | 19 (82.6) |
| Pink: 15 (19.2)Blue: 58 (74.4)Green: 5 (6.4) | Citrobacter spp. | 78 | 17 (21.8) |
| Pink: 2 (25.0)Blue: 6 (75.0)Green: 0 (0.0) | Proteus spp. | 8 | 8 (100.0) |
| Pink: 0 (0.0)Blue: 6 (100.0)Green: 0 (0.0) | Kluyvera spp. | 6 | 0 (0.0) |
| Pink: 0 (0.0)Blue: 1 (33.3)Green: 2 (66.7) | Pseudomonas spp. | 3 | 2 (66.7) |
| Pink: 0 (0.0)Blue: 1 (100.0)Green: 0 (0.0) | Aeromonas spp. | 1 | 1 (100.0) |
| Pink: 2 (66.7)Blue: 1 (33.3)Green: 0 (0.0) | Acinetobacter spp. | 3 | 2 (66.7) |
| Pink: 0 (0.0)Blue: 3 (75.0)Green: 1 (25.0) | Unidentified, GNB | 4 | 1 (25.0) |
| Pink: 0 (0.0)Blue: 2 (100.0)Green: 0 (0.0) | Unidentified, GPC | 2 | 1 (50.0) |
| Pink: 543 (67.0)Blue: 253 (31.2)Green: 14 (1.7) | 810 | 714 (88.1) |
KEC, Klebsiella species/Enterobacter species/Citrobacter species.