TABLE 1.

Broth dilution breakpoints for macrolides suggested by NCCLS for MAC

Drug	Method/pH	MIC (μg/ml) for category:
		Susceptible	Intermediate	Resistant
Clarithromycin	BACTEC 460TB or microdilution/6.8	≤16	32	≥64
Clarithromycin	BACTEC 460TB/7.3-7.4	≤4	8-16	≥32
Clarithromycin	Microdilution/7.3-7.4	≤8	16	≥32
Azithromycin	BACTEC 460TB/6.8	≤128	256	≥512