| species | indole | methyl red | voges - proskauer | citrate |
|---|---|---|---|---|
| escherichia coli | positive | positive | negative | negative |
| shigella spp | negative | positive | negative | negative |
| salmonella spp | negative | positive | negative | positive |
| klebsiella spp | negative | negative | positive | positive |
| proteus vulgaris | positive | positive | negative | negative |
| proteus mirabilis | negative | positive | negative | positive |
| enterobacter aerogenes | negative | negative | positive | positive |