TABLE 4.

Resistance specifications of clinical isolates included in the checkerboard assay

Species	No. of isolates	Resistance specificationsa,b
Pseudomonas aeruginosa	28	KPC-2+, VIM, carbapenem resistant, AmpCcon, AmpCind
Escherichia coli	42	TEM-1, 12, 52, 84, SHV-12, OXA-1, CTX-M-1, 2, 3, 9, 14, 15, KPC-2, VIM, VIM-1, LEN, GES-1, qnrB2
Klebsiella pneumoniae	39	TEM-1, 84, SHV-1, 2, 2A, 5,11, 12, 33, OXA-1, 48, CTX-M-1, 2, gr. 9, 15, 39, KPC, KPC-2, 3, VIM, VIM-1, LEN, GES-1, OmpK35red, OmpK36red, CMY-13, qnrA1
Enterobacter cloacae	16	TEM-1, 84, SHV-12, OXA-1, CTX-M-9, 15, 39, KPC, VIM
Enterobacter aerogenes	2	TEM-1, KPC-2, VIM-1
Citrobacter freundii	2	TEM-1, CTX-M-39, KPC-2

^aIsolates harbored one or multiple of the shown resistance mechanisms, but never all of them.

^bAmpCcon, AmpC derepressed; AmpCind, AmpC inducible.