Table 1.

In vitro antimicrobial susceptibility of MDR and non-MDR P. mirabilis isolates causing bloodstream infections^b

Antimicrobial agent	Non-MDR P. mirabilis (n = 63)			MDR P. mirabilis (n = 36)
	MIC (μg/ml)a		No. (%) susceptible	MIC (μg/ml)		No. (%) susceptible
	50%	90%		50%	90%
Amikacin	1	2	63 (100)	4	4	36 (100)
Amoxicillin-clavulanic acid	<0.38	0.5	63 (100)	4	8	36 (100)
Ampicillin	0.5	>256	32 (50.8)	>256	>256	0 (0)
Aztreonam	<0.016	<0.016	63 (100)	0.25	1	36 (100)
Cefepime	<0.016	0.064	63 (100)	4	32	25 (69.4)
Cefotaxime	<0.016	<0.016	63 (100)	8	32	0 (0)
Cefoxitin	1	2	63 (100)	4	8	36 (100)
Ceftazidime	<0.016	<0.016	63 (100)	2	4	33 (91.7)
Ceftriaxone	<0.016	<0.016	63 (100)	8	16	0 (0)
Ciprofloxacin	0.016	>32	50 (79.4)	>32	>32	3 (8.3)
Gentamicin	0.5	2	51 (80.9)	>32	>32	0 (0)
Levofloxacin	0.032	>32	50 (79.4)	>32	>32	3 (8.3)
Meropenem	0.023	0.03	63 (100)	0.03	0.12	36 (100)
Piperacillin-tazobactam	0.125	0.75	63 (100)	0.5	1	36 (100)
Trimethoprim-sulfamethoxazole	0.125	>4	42 (66.7)	0.125	>4	25 (69.4)

^aMICs that inhibit 50% and 90% of isolates, respectively.

^bMDR, multidrug resistant.