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Biochemical characteristics of Enterobacteriaceae.
| Organism | Indole | Methyl Red | Vogesproskauer | Citrate | Catalase | Oxidase |
|---|---|---|---|---|---|---|
| E. coli | + | + | - | - | + | - |
| Enterobacteraerogenes | - | - | + | + | + | - |
| Klebsiella pneumoniae | - | - | + | + | + | - |
| Salmonella Typhi | - | + | - | - | + | - |
| Shigella | - | + | - | - | + | - |
| Proteus vulgaris | + | + | - | - | + | - |
