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Gram-negative rods (Oxidase test? (Positive (MAC growth? (Good growth (Non…

- - - - Good growth
        
        Non-lactose fermenting (opaque)
        
        B. bronciseptica, Pseudomonas spp
      - Variable growth
        
        Lactose-fermenting (pink)
        
        Actinobacillus spp
  - - - Lactose-fermening (pink on MAC)
        
        E. coli, Klebsiella, Enterobacter, Citrobacter
      - Non-lactose fermenting (no colour change on MAC)
        
        Salmonella, Proteus, Yersinia, Edwardsiella
  - - - Good growth
        
        M. haemolytica
      - No growth
        
        P. multocida, Haemophilus