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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococci (Viridans group + penicillin-resistant) 0.25 64 0.02 － 64 Tetracycline (Sumycin, Achromycin V, Steclin) 476