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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococci (Viridans group + penicillin-susceptible) 0.25 8 0.03 － 8 Tetracycline (Sumycin, Achromycin V, Steclin) 476
Streptococci (Viridans group + penicillin-susceptible) >4 >8 ? － ? Tetracycline (Sumycin, Achromycin V, Steclin) 39