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Volume 10, Number 6—June 2004

Letter

CTX-M and Plasmid-mediated AmpC-Producing Enterobacteriaceae, Singapore

Tse Hsien Koh*Comments to Author , Grace Chee Yeng Wang*, Li-Hwei Sng*, Zhao Yi*, and Tse Yuen Koh†
Author affiliations: *Singapore General Hospital, Singapore; †Ngee Ann Polytechnic, Singapore

Main Article

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.

Main Article

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