TABLE 7.

CLSI disk diffusion QC ranges determined for cefepime (30 μg) and cefepime-enmetazobactam (30/20 μg) against relevant reference strains

Reference strain	Cefepime-enmetazobactam			Cefepime
	Inhibition zone diameter QC range (mm)a	No. of mm	% Of values in rangeb	Inhibition zone diameter QC range (mm)	No. of mm	% Of values in range
E. coli ATCC 25922	32–38	7	97.1	31–37c	7	97.1
E. coli ATCC 35218	32–38	7	100.0	31–37	7	100.0
E. coli NCTC 13353	27–33	7	100.0	6–15c ,d	10	99.5
K. pneumoniae ATCC 700603	26–32	7	98.3	23–29c	7	99.8
P. aeruginosa ATCC 27853	26–32	7	99.4	25–31c	7	99.2

^aQC ranges were approved at the January 2019 meeting of the CLSI Subcommittee on Antimicrobial Susceptibility Testing.

^bPercentage of values in range determined from 480 replicates performed in eight laboratories.

^cCurrent CLSI QC range (35).

^dExcluding data from one laboratory (statistical outlier).