Table 3.

Phenotypic extended-spectrum beta-lactamase screening for gram-negative bacteria.

Gram negative bacteria	Isolates (n)	Cephotaxime + clavulanic acid		Ceftazidime + clavulanic acid		Cefepime + clavulanic acid
		P	N	P	N	P	N
Enterobacteriaceae	250	97	153	72	178	58	192
Pseudomonas aeruginosa	10	6	4	6	4	3	7
Total	260	103	157	78	182	61	199

P – positive, N – negative, Enterobacteriaceae^{^}-include E. coli, P. mirabilis, K. pneumoniae, E. aerogenes and C. freundii.