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 2

Comparison of phenotypic and genotypic methods for detection of plasmid mediated AmpC β-lactamase in cefoxitin resistant Klebsiella spp. and Proteus mirabilis isolate.

Microorganisms	AmpC gene family	Number of isolates	Phenotypic tests
			ESBL	bla AmpC
				AmpC disc test	Inhibitor-based methods
					Cloxacillin	Phenylboronic acid
Klebsiella pneumoniae	CIT	1	+ve	−ve	−ve	+ve
Klebsiella pneumoniae	CIT-EBC-MOX	1	+ve	−ve	−ve	−ve
Klebsiella oxytoca	CIT-DHA-FOX	1	+ve	−ve	−ve	+ve
Klebsiella pneumoniae	—	1	−ve	+ve	+ve	−ve
Proteus mirabilis	CIT	1	−ve	+ve	+ve	−ve