TABLE 1.

Agar dilution MICs for 261 quinolone-susceptible strains^a

Drug and susceptilityb	MICc (μg/ml)
	Range	50	90
Penicillin
S	≤0.008-0.06	0.016	0.03
I	0.125-1.0	0.5	1.0
R	2.0->8.0	2.0	8.0
DK-507K
S	0.03-0.25	0.06	0.125
I	0.03-0.125	0.06	0.125
R	0.03-0.125	0.06	0.125
Sitafloxacin
S	0.016-0.25	0.06	0.125
I	≤0.008-0.125	0.06	0.125
R	0.03-0.25	0.06	0.125
Ciprofloxacin
S	0.5-4.0	2.0	4.0
I	0.5-4.0	2.0	2.0
R	0.5-4.0	2.0	2.0
Levofloxacin
S	0.5-2.0	1.0	2.0
I	0.5-2.0	1.0	2.0
R	0.5-2.0	1.0	2.0
Gatifloxacin
S	0.125-0.5	0.25	0.5
I	0.125-0.5	0.25	0.5
R	0.25-0.5	0.25	0.5
Moxifloxacin
S	0.06-0.25	0.125	0.25
I	0.06-0.25	0.125	0.25
R	0.06-0.25	0.125	0.25
Amoxicillin
S	≤0.008-0.125	0.03	0.03
I	0.03-2.0	0.5	2.0
R	1.0-8.0	4.0	8.0
Cefuroxime
S	≤0.008-0.25	0.03	0.125
I	0.25-8.0	0.5	8.0
R	2.0-32.0	8.0	16.0
Azithromycin
S	0.06->64.0	0.125	8.0
I	0.06->64.0	0.125	>64.0
R	0.06->64.0	>64.0	>64.0
Clarithromycin
S	≤0.016->64.0	0.03	4.0
I	≤0.016->64.0	0.06	>64.0
R	≤0.016->64.0	32.0	>64.0

^aLevofloxacin MICs, ≤2.0 μg/ml.

^bS, penicillin susceptible; I, penicillin intermediate; R, penicillin resistant.

^c50, MIC₅₀; 90, MIC₉₀.