head picture
vibrio cholerae on MacConkey
microscope picture gram negative rods

Vibrio cholerae on MacConkey agar

Overnight colonies of Vibrio cholerae on MacConkey agar tend to be small to moderately sized (1 to 3 mm) and usually appear as lactose-negative or slightly pink, often resembling colonies of “late” or “slow” lactose-fermenting organisms. Suspicious colonies should be subcultured to noninhibitory media for further testing.
Text: CDC
Gram-negative, curved, non-spore-forming rods.