TABLE 1.

Fluoroquinolone interpretive criteria for Salmonella used in this study

Antimicrobial and test	Interpretive criteria			Reference
	Susceptible	Intermediate	Resistant
Ciprofloxacin
MIC, μg/ml	≤0.06	0.12–0.5	≥1.0	6
Disk diffusion, mm	≥31	21–30	≤20	6
Levofloxacin
MIC, μg/ml	≤0.12	0.25–1.0	≥2.0	6
Disk diffusion, mm	≥28	19–27	≤18	5