| S. No. | Biochemical tests | S. aureus | S. typhi |
| 1 | Oxidase | − | − |
| 2 | Catalase | + | + |
| 3 | Coagulase | + | × |
| 4 | DNase | + | − |
| 5 | Indole | − | − |
| 6 | Urease | + | − |
| 7 | Citrate | + | + |
| 8 | H2S | − | + |
| 9 | Suc. Ferm. | + | + |
| 10 | Fruc. Ferm. | + | + |
| 11 | Gluc. Ferm. | + | + |
| 12 | Mannitol | + | + |
| 13 | Motility test | Non Motile | Motile |
| 14 | Morphology Gram staining | Gram positive | Gram negative Rods |