Table 6.
Susceptibility of cephalosporin-resistant Escherichia coli to ceftazidime, ceftriaxone, cefepime, and aztreonam using the CLSI 2009 and CLSI 2010 breakpoints according to the β-lactamase produced
| β-lactamase type (n) | % Of isolates susceptible to: |
|||||||
|---|---|---|---|---|---|---|---|---|
| Ceftazidime |
Ceftriaxone |
Aztreonam |
Ertapenem |
|||||
| CLSI 2009 | CLSI 2010 | CLSI 2009 | CLSI 2010 | CLSI 2009 | CLSI 2010 | CLSI 2009 | CLSI 2010 | |
| CTX-Ma (211) | 62.6 | 32.2 | 8.5 | 1.4 | 22.7 | 15.2 | 99.5 | 98.1 |
| CTX-M-1 (189) | 58.7 | 25.4 | 7.9 | 1.6 | 14.7 | 7.4 | 99.5 | 97.9 |
| CTX-M-2 (1) | 100 | 100 | 0 | 0 | 0 | 0 | 100 | 100 |
| CTX-M-9 (20) | 100 | 95 | 15 | 0 | 95 | 80 | 100 | 100 |
| SHVa (17) | 82.3 | 47 | 88.2 | 52.9 | 41.1 | 23.5 | 100 | 100 |
| TEM (4) | 25 | 0 | 100 | 75 | 75 | 50 | 75 | 75 |
| CMYa (48) | 12.5 | 0 | 14.6 | 0 | 47.9 | 12.5 | 97.9 | 93.8 |
| KPC (7) | 42.9 | 28.6 | 71.4 | 0 | 0 | 0 | 85.7 | 28.6 |
a
Coproducers were excluded.