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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococci (Viridans group + penicillin-susceptible) >0.06 >8 ? － ? Erythromycin (E-mycin, Ery-tab, Benzamycin) 39
Streptococci (Viridans group + penicillin-susceptible) 0.063 0.25 0.031 － 2 Erythromycin (E-mycin, Ery-tab, Benzamycin) 19
Streptococci (Viridans group + penicillin-susceptible) 0.25 1 ≤0.015 － 8 Erythromycin (E-mycin, Ery-tab, Benzamycin) 1396
Streptococci (Viridans group + penicillin-susceptible) 0.25 2 ≤0.25 － >4 Erythromycin (E-mycin, Ery-tab, Benzamycin) 43