The virulence factors attributed to Listeria monocytogenes include:
A. Cell attachment factors (internalins), hemolysins (listeriolysin O, two phospholipase Cs), and a protein that mediates actin-directed motility (ActA)
B. The organism is a facultative intracellular pathogen
C. The presence of capsule to resist phagocytosis
D. Only 'A' and 'B'
E. All of the above
Answer: D. Only 'A' and 'B'
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