To one half of the sterilized HiCrome Bacillus agar medium (Himedia, India), polymyxin B, the selective supplement, was added aseptically at 50 °C. It was mixed well and poured into sterile petriplates.
The other half was poured into the plates without the selective supplement. All isolates were streaked onto HiCrome Bacillus agar medium plates and incubated at 37 °C for 24 h and results were noted.