TABLE 1.

CLSI revised breakpoints, 2009 to 2010^a

Agent	MIC breakpoint for isolates in indicated category by:
	CLSI M100-S19 (2009)			CLSI M100-S20 (2010)
	Susc	Int	Res	Sus	Int	Res
Cefazolin	≤8	16	≥32	≤1	2	≥4
Cefotaxime	≤8	16–32	≥64	≤1	2	≥4
Ceftriaxone	≤8	16–32	≥64	≤1	2	≥4
Ceftazidime	≤8	16	≥32	≤4	8	≥16
Aztreonam	≤8	16	≥32	≤4	8	≥16

^aData are from references 1 and 20. Susc, susceptible; Int, intermediate; Res, resistant.