| Test | NS2 (Providencia stuartii) | NS4D (Providencia alcalifaciens) | NS4G (PS) Bacillus sp | NS4Y (Providencia alcalifaciens) | NS4W (Streptococcus sp.) | NS4B (Micrococcus sp.) | NS3 (Staphylococcus sp.) |
| Gram’s reaction | − | − | + | − | + | + | + |
| Cell shape | Small rods | Short rods | Short rod | Small rods | Cocci in chains | Cocci in short chains | Cocci cluster |
| Colony characteristics | Dull | Dull | Yellow | Dull | White | Yellow | Yellow |
| Spore | − | − | + | − | − | − | − |
| Indole | + | − | + | + | − | − | − |
| Coagulase | − | − | − | − | − | − | + |
| Catalase | + | + | + | + | − | + | + |
| Oxidase | − | − | − | − | − | − | − |
| Urease | + | + | + | + | + | − | + |
| Starch hydrolysis | + | + | + | + | + | + | + |
| Glucose | A | A | A | A | A | A | A |
| Lactose | A | AG | G | A | A | A | AG |
| Mannitol | AG | AG | AG | AG | AG | AG | AG |