| Microorganism | MIC50 (μg/ml)
 | MIC90 (μg/ml)
 | Range (μg/ml)
 | Antimicrobial | Reference | 
            
			        
			            | Proteus mirabilis | 1.6 | 6.2 | ? - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 1386 | 
                
			        
			            | Proteus mirabilis | 4 | 8 | ? - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 1389 | 
                
			        
			            | Proteus mirabilis | 4 | 32 | ? - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 1389 | 
                
			        
			            | Proteus mirabilis | - | - | 0.78 - 25 | Cephalothin (Cefalotin, Keflin, Seffin) | 1410 | 
                
			        
			            | Proteus mirabilis | - | - | 1 - >128 | Cephalothin (Cefalotin, Keflin, Seffin) | 1447 | 
                
			        
			            | Proteus mirabilis | - | - | 1.6 - >100 | Cephalothin (Cefalotin, Keflin, Seffin) | 1414 | 
                
			        
			            | Proteus mirabilis | - | - | 2.2 - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 1447 | 
                
			        
			            | Proteus mirabilis | - | - | 6.2 - 100 | Cephalothin (Cefalotin, Keflin, Seffin) | 1418 | 
                
			        
			            | Proteus mirabilis | - | - | 23.9 - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 959 | 
                
			        
			            | Proteus mirabilis | - | - | 239 - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 91 | 
                
			        
			            | Proteus mirabilis | - | - | 400 - ? | Cephalothin (Cefalotin, Keflin, Seffin) | 1418 |