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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococci (Viridans group + penicillin-susceptible) 0.5 2 0.5 － 2 Levofloxacin (Levaquin, Quixin) 19
Streptococci (Viridans group + penicillin-susceptible) 1 2 0.5 － 2 Levofloxacin (Levaquin, Quixin) 117
Streptococci (Viridans group + penicillin-susceptible) 1 2 ? － ? Levofloxacin (Levaquin, Quixin) 39
Streptococci (Viridans group + penicillin-susceptible) 2 8 ≤0.015 － 64 Levofloxacin (Levaquin, Quixin) 1396