Phenotypic and Molecular Characterization of Plasmid Mediated AmpC β-Lactamases among Escherichia coli, Klebsiella spp., and Proteus mirabilis Isolated from Urinary Tract Infections in Egyptian Hospitals

Table 1

Comparison of phenotypic and genotypic methods for detection of pAmpC β-lactamase in cefoxitin resistant E. coli isolates.

		Phenotypic test
		ESBL	AmpC disc test	Inhibitor-based methods using
AmpC gene family	Number of isolates			Cloxacillin	Phenylboronic acid
MOX	2	+ve	+ve	+ve	−ve
FOX	1	−ve	−ve	−ve	−ve
CIT	1	−ve	+ve	+ve	+ve
CIT	7	+ve	+ve	+ve	+ve
CIT	2	+ve	+ve	+ve	−ve
CIT-DHA	2	+ve	+ve	+ve	+ve
CIT-DHA	1	−ve	+ve	+ve	+ve
CIT-FOX	1	+ve	+ve	+ve	+ve
FOX-MOX	1	+ve	+ve	+ve	−ve
—	2	+ve	−ve	−ve	+ve
CIT-EBC	1	+ve	+ve	+ve	−ve