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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Haemophilus influenzae (ampicillin-resistant + β-lactamase negative) >1 >8 0.25 － >8 Tetracycline (Sumycin, Achromycin V, Steclin) 462