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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococci (Viridans group) 0.5 1 0.25 － >8 Levofloxacin (Levaquin, Quixin) 73
Streptococci (Viridans group) 1 2 ≤0.03 － >4 Levofloxacin (Levaquin, Quixin) 265
Streptococci (Viridans group) 1 2 ≤0.25 － 4 Levofloxacin (Levaquin, Quixin) 371
Streptococci (Viridans group) 1 2 0.25 － 4 Levofloxacin (Levaquin, Quixin) 120
Streptococci (Viridans group) 1 2 1 － 4 Levofloxacin (Levaquin, Quixin) 3