TABLE 1.

Disk diffusion and Etest results

Isolate	Inhibition zone diam (mm)		Etest MIC (μg/ml)		Related isolatesa
	Ceftazidime	Meropenem	Ceftazidime	Meropenem
Reference S. aureus ATCC 25923	20 (≥16)	35 (≥16)		0.032
Reference E. coli ATCC 25922	27 (≥16)	33 (≥16)		0.008
Reference P. aeruginosa ATCC 27853	27 (≥16)	33 (≥16)		0.19
Reference B. pseudomallei strains
NCTC 10276	25	27	2	1
DM 98 (mucoid)	27	16	4	4
NCTC 13177	29	27	2	1	A
Western Australia clinical B. pseudomallei isolates
BCC 1	28	25	2	1.5	B
BCC 2	27	25	2	1.5	A
BCC 3	28	25	2	1	A
BCC 4	28	25	2	1	A
BCC 8	29	27	3	0.75	A
BCC 16	27	26	2	1	B
BCC 33	28	26	2	1	A
BCC 36	29	25	2	1	A
BCC 71	27	24	2	1.5
BCC 74	24	25	2	0.75
BCC 105	25	22	3	1.5	C
BCC 107	27	25	3	1.5
BCC 109	27	26	3	1.5	C
BCC 110	25	23	3	1.5	C
BCC 122	25	25	4	1
Queensland clinical B. pseudomallei isolates
BCC 75	29	25	3	1
BCC 76	28	27	3	1.5
BCC 77	25	26	3	1
BCC 78	29	27	3	1.5
BCC 79	28	25	2	1
BCC 80	28	27	3	1.5
BCC 81	27	26	3	1
BCC 83	27	26	3	1.5
BCC 85	28	27	3	1.5
BCC 86	29	26	3	1.5
BCC 87	25	26	4	1
Northern Territory clinical B. pseudomallei isolates
BCC 18	27	27	3	1.5
BCC 49	26	27	3	1
BCC 50	28	26	2	1.5
BCC 51	27	24	3	1.5
BCC 52	26	24	3	1.5
BCC 53	26	26	3	1
BCC 69	30	31	2	0.5
BCC 72	25	24	3	1.5
Australian environmental B. pseudomallei isolates
BCC 21	28	23	2	1.5	A
BCC 22	0	24	>256	0.38
BCC 23	29	26	2	0.75
BCC 24	30	28	0.75	0.5
BCC 26	26	25	3	1.5
BCC 27	30	25	1.5	1
BCC 28	25	25	3	1.5
BCC 29	26	25	3	0.75
BCC 30	25	25	2	1
BCC 31	28	25	2	1
BCC 44	28	26	2	1.5	A
BCC 45	29	25	2	1.5	A
BCC 46	29	25	2	1	A

^aRelated isolates are groups of epidemiologically related bacteria that cluster by genetic typing.