| Microorganism | MIC50 (μg/ml)
 | MIC90 (μg/ml)
 | Range (μg/ml)
 | Antimicrobial | Reference | 
            
			        
			            | Proteus mirabilis | 8 | 16 | 4 - 32 | Cefazolin (Ancef, Kefzol, Zolicef) | 1438 | 
                
			        
			            | Proteus mirabilis | - | - | 1 - 64 | Cefazolin (Ancef, Kefzol, Zolicef) | 1447 | 
                
			        
			            | Proteus mirabilis | - | - | 2.5 - ? | Cefazolin (Ancef, Kefzol, Zolicef) | 1447 | 
                
			        
			            | Proteus mirabilis | - | - | 50 - ? | Cefazolin (Ancef, Kefzol, Zolicef) | 1438 | 
                
			        
			            | Proteus mirabilis | - | - | 97 - ? | Cefazolin (Ancef, Kefzol, Zolicef) | 1132 |