| Characteristic | Isolates | ||
| S. marcescens PH1 | B. subtilis PH | S. marcescens PH2 | |
| Colony color in nutrient agar | Dark red | White | Slight red |
| Colony color in Pikovskaya agar | White | White | White |
| Gram reaction | Negative | Positive | Negative |
| Cell shape | Rods | Rods | Rods |