TABLE 2.

Results of inhibitor-based disk tests with negative control strains

Strain	Organism	Resistance mechanism	Result with druga-inhibitor combination
			CTT (LN)b	CTT (48)c	FOX (LN)	FOX (48)	CPD (LN)	CPD (48)	CTX (LN)	CTX (48)	CAZ (LN)	CAZ (48)
Kleb67	K. oxytoca	Hyper K1	Nd	N	N	N	Pe	P	P	P	N	N
Kleb196	K. pneumoniae	OMP	N	N	N	N	N	N	N	N	N	N
PAB-C14	E. coli	SHV-2	N	N	N	N	N	P	N	P	N	P
Kleb116	K. pneumoniae	SHV-5	N	N	N	N	N	P	P	P	N	P
PAB-C3	E. coli	TEM-3	N	N	N	N	N	P	P	P	N	P
PAB-C10	E. coli	TEM-10	N	N	N	N	N	P	N	P	N	P
Misc337	E. coli	CTX-M-1	N	N	N	N	N	P	P	P	N	N
Misc419	E. coli	CTX-M-14	N	N	N	N	P	P	N	P	N	N
PAB-C19	E. coli	OXA-2	N	N	N	N	N	N	N	N	N	P
Kleb265	K. pneumoniae	KPC-1	P	N	N	N	P	N	P	N	N	N

^aDrugs tested: cefotetan (CTT), cefoxitin (FOX), cefpodoxime (CPD), cefotaxime (CTX), and ceftazidime (CAZ).

^bInhibitor LN-2-128.

^cInhibitor 48-1220.

^dN, negative test: increase of ≤3 mm in zone diameter in the presence of the inhibitor.

^eP, positive test: increase of ≥4 mm in zone diameter in the presence of the inhibitor.