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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Streptococcus pneumonia 0.25 - ? － ? Cefaclor (Ceclor, Ceclor CD) 308
Streptococcus pneumonia 0.5 1 0.12 － 4 Cefaclor (Ceclor, Ceclor CD) 274
Streptococcus pneumonia >1 >8 0.25 － >8 Cefaclor (Ceclor, Ceclor CD) 120
Streptococcus pneumonia >1 >32 0.12 － >32 Cefaclor (Ceclor, Ceclor CD) 119
Streptococcus pneumonia (pbp2x and pbp2b or pbp1a and pbp2x genes abnormal + penicillin) 8 8 0.5 － 16 Cefaclor (Ceclor, Ceclor CD) 121
Streptococcus pneumonia (pbpla, pbp2x, and pbp2b genes abnormal + penicillin-resistant) 64 64 16 － 64 Cefaclor (Ceclor, Ceclor CD) 121