Table 1.

Minimum inhibitory concentrations of the piperacillin/tazobactam-resistant and piperacillin/tazobactam-susceptible isolates.

	GEN	TET	CHL	CIP	AMC	TZP	TZP + PAβN
TZP-susceptible	128 µg/ml	256 µg/ml	4 µg/ml	64 µg/ml	32 µg/ml	2–4/4 µg/ml	2/4 µg/ml
TZP-resistant	1024–>1024 µg/ml	512 µg/ml	4 µg/ml	128 µg/ml	64–128 µg/ml	64/4 µg/ml	32/4 µg/ml

Minimum inhibitory concentrations (MIC) of gentamicin (GEN), tetracycline (TET), chloramphenicol (CHL), ciprofloxacin (CIP), amoxicillin/clavulanic acid (AMC) and piperacillin/tazobactam (TZP) (with and without Phenylalanine-arginine β-naphthylamide (PAβN)) towards the TZP-susceptible and TZP-resistant isolates. Determination of MICs were performed in triplicate (n = 3).