Table 2.

In vitro susceptibilities of Brucella melitensis isolates to 11 antibiotics

Antibiotics	Range (mg/l)	MIC50 (mg/l)	MIC90 (mg/l)
Tetracycline	0.032 – 1.5	0.125	0.5
Rifampicin	0.094 – 1.5	0.5	1
Streptomycin	0.125 – 4	1	2
Gentamicin	0.032–1.5	0.19	2
Norfloxacin	0.125 – 4	1.5	3
Ciprofloxacin	0.016 – 0.75	0.19	0.5
Levofloxacin	0.064 – 0.75	0.25	0.5
Trimethoprim/sulfamethoxazole	0.032/0.61 – 1.5/28.5	0.125/2.38	0.75/14.2
Ampicillin	0.094 – 3	0.75	2
Amoxicillin/clavulanic acid	0.032 – 1.5	0.38	1
Erythromycin	0.5 – 8	1.5	4