TABLE 1.

Properties of 43 P. aeruginosa isolates

Isolate type (n)a	MIC range (μg/ml)		No. of isolates with positive result
	Imipenem	Ceftazidime	MBL-Etest	DDST	CDT	MBL
						All 3 assays	At least 1 assay
Group A (27)
MHA	1->32	4-256	4	12	3	2	15
MHA + Zn2+	>32	32->256	27	18	26	18	27
Group B (16)
MHA	4-32	4->256	1	1	2	0	4
MHA + Zn2+	4->32	8->256	1	1	2	0	3

^aGroup A is VIM-2 positive, and group B is MBL negative.