TABLE 2.

In vitro activities of eight antibiotics against 169 isolates of F. tularensis^a

Antimicrobial	Type B strains			Type A strains
	MIC range	MIC50	MIC90	MIC range	MIC50	MIC90
Aminoglycosides
Gentamicin	0.03-0.5	0.12	0.25	0.03-0.25	0.06	0.12
Streptomycin	0.25-4	1	2	0.25-4	1	2
Tetracyclines
Tetracycline	0.25-2	0.5	1	0.12-2	0.5	1
Doxycycline	0.25-4	1	2	0.25-2	0.5	1
Fluoroquinolones
Ciprofloxacin	0.004-0.06	0.03	0.06	0.008-0.06	0.015	0.03
Levofloxacin	0.015-0.12	0.03	0.06	0.015-0.12	0.03	0.06
Phenicols
Chloramphenicol	0.5-4	2	2	0.5-2	1	2
Other
Erythromycin	0.5-4	2	2	0.5-2	0.5	0.5

^aValues are in micrograms per milliliter.