Morphological differences between OB and OS on Ashdown’s agar.

<p><b>(A & B)</b> OB colonies were visible after 24 hours of incubation, and continued to grow larger up to 48 hours of incubation. OS morphotype only appeared as small colonies after 48 hours of incubation. <b>(C)</b> OB showed rough, wrinkled, and irregular morphology, while OS showed smooth and round morphology after 72 hours of incubation.