Table 2.

Fractional inhibitory concentrations (FICs) of the five antibiotics.

Antibiotics1	FICs (μg/mL)	Effect
MTR&VAN	0.625 (0.25, 0.5)	Partially synergistic
MTR&CLI	3 (2, 64)	Antagonistic
MTR&CAZ	2 (2, 8)	Indifferent
MTR&AMP	2 (2, 32)	Indifferent
VAN&CLI	2.125 (0.125, 64)	Antagonistic
VAN&CAZ	1.0625 (0.0625, 8)	Indifferent
VAN&AMP	1.25 (0.25, 32)	Indifferent
CLI&CAZ	4 (64, 16)	Antagonistic
CLI&AMP	1.125 (4, 32)	Indifferent
CAZ&AMP	1 (4, 16)	Additive

¹MTR, metronidazole; VAN, vancomycin; CLI, clindamycin; CAZ, ceftazidime; AMP, ampicillin.