Table 4.

MICs of β-lactam antibiotics for S. maltophilia KJ and its derived mutants

Strain	MIC (μg/ml)
	PIP	CAR	FOX	CXM	ATM
KJ	1,024	1,024	1,024	2,048	>2,048
KJΔZ	64	512	512	512	2,048
KJΔDI	1,024	1,024	1,024	2,048	>2,048
KJΔDIΔZ	256	512	512	512	2,048
KJΔmrcA	2,048	2,048	1,024	2,048	>2,048
KJΔmrcAΔZ	1,024	1,024	1,024	1,024	2,048
KJΔDIΔmrcA	2,048	2,048	1,024	2,048	>2,048
KJΔDIΔmrcAΔZ	1,024	2,048	1,024	2,048	2,048