TABLE 1.

Bacterial strains

Strain	Description	pI of β-lactamase(s)	Source
K. pneumoniae 5064	Clinical isolate	5.6, 7.2, 7.6	This study
E. coli DH5-α	Recipient strain for plasmid transformation	None	Invitrogen
E. coli DH5-α/p5064	Carries ∼125-kb plasmid p5064 from K. pneumoniae 5064	5.6, 7.2	This study
E. coli DH5-α/pFOX-5	Carries plasmid pFOX-5, 1.7-kb subclone of p5064 in pACYC184	7.2	This study