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Microorganism MIC50
(μg/ml)		 MIC90
(μg/ml)		 Range
(μg/ml)		 Antimicrobial Reference
Proteus spp. (indole-positive) >128 >128 0.25 － >129 Cefazolin (Ancef, Kefzol, Zolicef) 1438
Proteus spp. (indole-positive) - - 0.5 － >128 Cefazolin (Ancef, Kefzol, Zolicef) 1447