Question

The best procedure to differentiate listeria monocytogenes from corynebacterium species is

a. catalase

b. coagulase

c. motility

d. gram stain

Answer 1

C. Motility --> Listeria is motile (tumbles over each other in microscope), whereas Corynebact. is non-motile
**Both: Gram (+) rods, catalase (+)
Other tests: Nitrate reduction and sugar fermentation