TABLE 7.

Antimicrobial resistance of enterococcal isolates from the irrigation return flows (IRFs) and background canal site (MLC).

Antimicrobial	Breakpoint (μ g mL–1)	No. of resistant (%)
		IRFs	MLC
		(n = 173)	(n = 12)
Chloramphenicol	≥32	2 (1.2)	0 (0)
Ciprofloxacin	≥4	2 (1.2)	0 (0)
Daptomycin	≥8	1 (0.6)	0 (0)
Erythromycin	≥8	1 (0.6)	0 (0)
Gentamicin	≥512	0 (0)	0 (0)
Kanamycin	≥1024	2 (1.2)	0 (0)
Lincomycin	≥8	130 (75.1)	8 (66.7)
Linezolid	≥8	0 (0)	0 (0)
Nitrofurantoin	≥64	50 (28.9)	6 (50)
Penicillin	≥16	1 (0.6)	0 (0)
Quinupristin/dalfopristin	≥4	33 (19.1)	1 (8.3)
Streptomycin	≥1024	2 (1.2)	0 (0)
Tetracycline	≥16	20 (11.6)	2 (16.7)
Tigecycline	≥0.5	0 (0)	0 (0)
Tylosin tartrate	≥32	2 (1.2)	0 (0)
Vancomycin	≥32	0 (0)	0 (0)