| Characteristics | LAB-A | LAB-B |
| Colony Color | White | Creamy White |
| Colony Shape | As a surface colony, they are Small, irregular, Cottony-fluffy colonies | As a surface colony, they are Large, Circular, Lenticular colonies in middle of the medium |
| Surface | Rough | Smooth |
| Elevation | Convex to umbonate | Raised |
| Margin | Undulate | Entire |
| Gram staining | + | + |
| Catalase test | − | − |
| Milk coagulation test | + | + |
| NaCl tolerance test |
|
|
| 1.5% | + | + |
| 2.5% | + | − |
| 3.5% | + | − |
| 4.5% | − | − |
| Possibility of strains | L. acidophilus | L. bulgaricus |