Table 1. Carbapenem susceptibility and strain typing results for isolates tested in the study*.

Organism	Imipenem broth microdilution MIC† (μg/mL) and CLSI interpretation	Meropenem broth microdilution MIC (μg/mL) and CLSI interpretation	PFGE profile	Hospital identification no.
1 Klebsiella pneumoniae	8 I	16 R	A	1
2 K. pneumoniae	16 R	>16 R	A	1
3 K. pneumoniae	16 R	16 R	A	2
4 K. pneumoniae	8 I	8 I	A	2
5 K. pneumoniae	16 R	>16 R	A	2
6 K. pneumoniae	16 R	16 R	A	2
7 K. pneumoniae	16 R	16 R	A	3
8 K. pneumoniae	32 R	16 R	A	4
9 K. pneumoniae	16 R	>16 R	B	1
10 K. pneumoniae	16 R	>16 R	B	1
11 K. pneumoniae	16 R	16 R	C	4
12 K. pneumoniae	16 R	16 R	D	1
13 K. pneumoniae	16 R	16 R	E	4
14 K. pneumoniae	16 R	>16 R	F	1
15 K. pneumoniae	16 R	>16 R	F1	4
K. pneumoniae 1534 (control)	16 R	>16 R	NA	NA
Serratia marcescens 525 (control)	>16 R	>16 R	NA	NA

*CLSI, Clinical and Laboratory Standards Institute; PFGE, pulsed-field gel electrophoresis; NA, not applicable.†Interpretations of MIC results used CLSI criteria (18); I, intermediate; R, resistant.