| Basic Characteristics | Properties (Citrobacter freundii) |
| Capsule | Negative (-ve) |
| Catalase | Positive (+ve) |
| Citrate | Positive (+ve) |
| Flagella | Positive (+ve) |
| Gas from glucose | Positive (+ve) |
| Gelatin Hydrolysis | Negative (-ve) |
| Gram Staining | Negative (-ve) |
| Growth in KCN | Positive (+ve) |
| H2S | Positive (+ve) |
| Indole | Negative (-ve) |
| Motility | Positive (+ve) |
| MR (Methyl Red) | Positive (+ve) |
| Nitrate Reduction | Positive (+ve) |
| OF (Oxidative-Fermentative) | Facultative Anaerobes |
| Oxidase | Negative (-ve) |
| Pigment | Negative (-ve) |
| Shape | Rods |
| Spore | Negative (-ve) |
| Urease | Variable |
| VP (Voges Proskauer) | Negative (-ve) |
| Adonitol | Negative (-ve) |
| Arabinose | Positive (+ve) |
| Arabitol | Negative (-ve) |
| Cellobiose | Positive (+ve) |
| DNase | Negative (-ve) |
| Dulcitol | Negative (-ve) |
| Glutamate | Positive (+ve) |
| Glycerol | Positive (+ve) |
| Glycogen | Positive (+ve) |
| Inositol | Negative (-ve) |
| Lactose | Positive (+ve) |
| Lactulose | Positive (+ve) |
| Malonate | Negative (-ve) |
| Maltitole | Negative (-ve) |
| Maltose | Positive (+ve) |
| Mannitol | Positive (+ve) |
| Mannose | Positive (+ve) |
| Melibiose | Positive (+ve) |
| Mucate | Positive (+ve) |
| MyoInositol | Positive (+ve) |
| Palatinose | Negative (-ve) |
| Raffinose | Variable |
| Rhamnose | Positive (+ve) |
| Salicin | Negative (-ve) |
| Sorbitol | Positive (+ve) |
| Sorbose | Positive (+ve) |
| Sucrose | Positive (+ve) |
| Tartrate | Negative (-ve) |
| Trehalose | Positive (+ve) |
| Xylose | Positive (+ve) |
| Acetate Utilization | Positive (+ve) |
| Aesculine Hydrolysis | Negative (-ve) |
| Arginine Dehydrolase | Variable |
| Esculin Hydrolysis | Negative (-ve) |
| Lipase | Negative (-ve) |
| Lysine decarboxylase | Negative (-ve) |
| ONPG (β-galactosidase) | Positive (+ve) |
| Ornithine decarboxylase | Negative (-ve) |
| Phenylalanine deaminase | Negative (-ve) |
| Tryptophan deaminase | Variable |
| Tyrosine hydrolysis | Positive (+ve) |