Table 1. Antimicrobial classes, antimicrobial agents, concentration ranges, and susceptibility breakpoints for Campylobacter isolates.

Antimicrobial Class	Antimicrobial Agent	Concentration Range (μg/mL)	MIC Interpretive Standard (μg/mL)A
			Susceptible	Resistant
Aminoglycosides	Gentamicin	0.12–32	≤2	≥4
Ketolides	Telithromycin	0.015–8	≤4	≥8
Lincosamides	Clindamycin	0.03–16	≤2	≥4
Macrolides	Azithromycin	0.015–64	≤2	≥4
	Erythromycin	0.03–64	≤8	≥16
Phenicols	Florfenicol	0.03–64	≤4	N/A
Quinolones	Ciprofloxacin	0.015–64	≤1	≥2
	Nalidixic acid	4–64	≤16	≥32
Tetracyclines	Tetracycline	0.06–64	≤4	≥8

^AIsolates were tested for antimicrobial susceptibility using an automated broth microdilution technique (Sensititre®). Minimum inhibitory concentration (MIC) interpretive standards of the Canadian Integrated Program for Antimicrobial Resistance Surveillance (for most antimicrobials) [15] or the Centers for Disease Control and Prevention (for telithromycin) [25] were used to classify isolates as susceptible or resistant (resistant plus intermediate).