Table 2. Bacitracin MIC values (µg/mL) of C. perfringens strain c1261_A grown with different concentrations of efflux pump inhibitors.

	Efflux pump inhibitor concentration (µg/mL)
	0	1	2	4	8	16	32	64	128	256	512	1024	2048
Efflux pump inhibitor(MIC, µg/mL)	Bacitracin MIC value (µg/mL)
MK-571 (64)	512	512	512	512	512	256	128	–
Thioridazine (16)	512	512	256	256	8	–	–	–
Prochlorperazine (64)	512	512	512	512	512	512	256	–
Verapamil (1024)	512	512	512	512	512	512	512	512	512	256	128	–	–
Probenecid (1024)	512	512	512	512	512	512	512	512	512	512	512	–	–
Reserpine (2048)	512	512	512	512	512	512	512	512	512	512	512	256	–

Blank area, concentrations not tested; –, no bacterial growth due to efflux pump inhibitors.