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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Haemophilus influenzae (β-lactamase negative) 0.5 0.5 0.25 － 1 Tetracycline (Sumycin, Achromycin V, Steclin) 462