Volume 10, Number 6—June 2004
Letter
CTX-M and Plasmid-mediated AmpC-Producing Enterobacteriaceae, Singapore
Tse Hsien Koh*
, Grace Chee Yeng Wang*, Li-Hwei Sng*, Zhao Yi*, and Tse Yuen Koh†
, Grace Chee Yeng Wang*, Li-Hwei Sng*, Zhao Yi*, and Tse Yuen Koh†Table
Characteristics of isolates containing CTX-M and plasmid-mediated AmpC β-lactamases
| Isolate | Species | MIC (μg/mL)a |
pIb | Sequenced β-lactamase | |||
|---|---|---|---|---|---|---|---|
| CAZ | FEP | CRO | AZT | ||||
| EU17113 |
K. pneumoniae |
4 |
4 |
128 |
2 |
7.2, 7.5, 8.0 |
CTX-M-9 type |
| EU2673 |
K. pneumoniae |
128 |
128 |
>256 |
>256 |
5.8, 7.2, 7.5, 9.0 |
CTX-M-15 type |
| EU2657 |
E. coli |
16 |
128 |
>256 |
64 |
5.1, 6.3, 7.2, 7.5, 8.0 |
CTX-M-2 type |
| EU4855 |
E. coli |
>256 |
4 |
>256 |
64 |
8.8 |
CMY-2 type |
| EB9505 | E. coli | 128 | 1 | 256 | 8 | 5.1, 8.8 | CMY-2 type |
aK. pneumoniae, Klebsiella pneumoniae; E. coli, Escherichia coli; CAZ, ceftazidime; FEP, cefepime; CRO, ceftriaxone; AZT, aztreonam.
bIsoelectric points of β-lactamases.
