TABLE 4.
Frequency distribution of cefotaxime and ceftazidime MIC ratios among E. coli and K. pneumoniae isolates producing CTX-M and other types of ESBLs
| MIC ratio (cefotaxime/ceftazidime) | No. (%) of E. coli isolates producing:
|
No. (%) of K. pneumoniae isolates producing:
|
||
|---|---|---|---|---|
| CTX-M ESBLs (n = 28) | Non-CTX-M ESBLs (n = 50) | CTX-M ESBLs (n = 87) | Non-CTX-M ESBLs (n = 161) | |
| 1/64 | 0 | 0 | 0 | 3 (1.9) |
| 1/32 | 0 | 1 (2.0) | 0 | 13 (8.1) |
| 1/16 | 0 | 7 (14.0) | 0 | 20 (12.4) |
| 1/8 | 0 | 8 (16.0) | 0 | 25 (15.5) |
| 1/4 | 0 | 9 (18.0) | 0 | 15 (9.3) |
| 1/2 | 0 | 7 (14.0) | 0 | 25 (15.5) |
| 1 | 4 (14.3) | 8 (16.0) | 14 (16.1) | 37 (23.0) |
| 2 | 2 (7.1) | 4 (8.0) | 12 (13.8) | 14 (8.7) |
| 4 | 4 (14.3) | 5 (10.0) | 16 (18.4) | 7 (4.3) |
| 8 | 4 (14.3) | 0 | 17 (19.5) | 1 (0.6) |
| 16 | 5 (17.9) | 1 (2.0) | 18 (20.7) | 1 (0.6) |
| 32 | 6 (21.4) | 0 | 2 (2.3) | 0 |
| 64 | 2 (7.1) | 0 | 7 (8) | 0 |
| 128 | 1 (3.6) | 0 | 1 (1.1) | 0 |