The grayish colonies surrounded by black halos with possible greenish sheen on Oxford agar or green–blue colonies surrounded by an opaque halo zone on Chromogenic Listeria agar were regarded as suspected colonies.
The grayish colonies surrounded by black haloswith possible greenish sheen on Oxford agar or green–blue coloniessurrounded by an opaque halo zone on Chromogenic Listeria agarwere regarded as suspected colonies.