TABLE 1.
Characterization of resistance to polymyxin antibiotics among Enterobacterales and non-Enterobacterales as determined by agar dilution
| Isolate | n (%) |
n (%) of organisms intermediate to: |
|
|---|---|---|---|
| Polymyxin B | Colistin | ||
| Enterobacter cloacae complex | 19 (26) | 5 (26) | 4 (21) |
| Escherichia coli | 20 (27) | 17 (85) | 18 (90) |
| Klebsiella aerogenes | 4 (5) | 4 (100) | 4 (100) |
| Klebsiella pneumoniae | 30 (41) | 6 (20) | 7 (23) |
| Raoultella ornithinolytica | 1 (1) | 0 | 0 |
| Total Enterobacterales | 74 (57) | 32 (43) | 33 (45) |
| Acinetobacter baumannii complex | 28 (51) | 23 (82) | 23 (82) |
| Pseudomonas aeruginosa | 27 (49) | 27 (100) | 27 (100) |
| Total non-Enterobacterales | 55 (43) | 50 (91) | 50 (91) |
| Total isolates | 129 | 82 (64) | 83 (64) |