Table 5.

Cefepime MIC distributions of cephalosporin-resistant Escherichia coli isolates according to the β-lactamase produced

β-lactamase (n)	% Of isolates (cumulative %) for which the MIC (μg/ml) was:
	Susceptible		Intermediate (16)	Resistant
	≤4	8		32	>32
CTX-Ma (211)	43.6 (43.6)	23.2 (66.8)	19.9 (86.7)	8.1 (94.8)	5.2 (100)
CTX-M-1 group (189)	40.2 (40.2)	23.3 (63.5)	21.7 (85.2)	9 (94.2)	5.8 (100)
CTX-M-2 group (1)	0 (0)	0 (0)	100 (100)	0 (100)	0 (100)
CTX-M-9 group (20)	80 (80)	20 (100)	0 (100)	0 (100)	0 (100)
SHVa (17)	94.1 (94.1)	0 (94.1)	5.9 (100)	0 (100)	0 (100)
TEM (4)	75 (75)	0 (75)	0 (75)	0 (75)	25 (100)
CMYa (48)	97.9 (97.9)	0 (97.9)	0 (97.9)	2.1 (100)	0 (100)
KPC (7)	71.4 (71.4)	14.3 (85.7)	14.3 (100)	0 (100)	0 (100)

^aCoproducers were excluded from analysis.